Covid 12/31: Meet the New Year

Same as the old year. 

It’s deja vu all over again. It’s not good.

We’re focused on political fights over priority and concerns someone might jump the line, and took off for Christmas. Doctors get forty-six dollars for administering two vaccine shots, and aren’t allowed to bill for anything involved, including either office visit. The vaccine rollout is sufficiently botched that we now have to be worried about millions of doses spoiling and going unused

It’s that bad.

Meanwhile, here we go again. The evidence from this week points to the baseline scenario laid out last week being correct. The new strain is here. It is almost certainly more infectious, probably as much more infectious as feared, and has been identified in multiple states. This is going to happen and there is nothing left capable of stopping it. 

Eventually, some day, hopefully even some time in 2021, one way or another, this all will end. 

Alas, it will not be tonight at midnight. 

Let’s run the numbers.

The Numbers


Last week’s prediction: 13.6% positive rate on 10.1 million tests, and an average of 2,500 deaths.

Results: 13.8% positive rate on 9.1 million tests, and an average of 2,287 deaths.

That looks like a straightforward case of not taking the drop-off from Christmas seriously enough, with deaths and tests both down 10% more than predicted, and the positive rate what you’d expect accordingly. These are temporary slash artificial drops. 

But it’s hard to know when we will be back on a normal track, because things still weren’t back to normal today, and New Year’s Eve is upon us, and also the real effects of Christmas are about to arrive and the last two days positive rates are super scary. 

Prediction: 14.3% positive rate on 9.7 million tests, and an average of 2,500 deaths, again with wide error bars.


Oct 29-Nov 495619772309613
Nov 5-Nov 11108927122535870
Nov 12-Nov 181255293428181127
Nov 19-Nov 251761416933961714
Nov 26-Dec 21628381427421939
Dec 3-Dec 92437550842862744
Dec 10-Dec 163278532443763541
Dec 17-Dec 233826515851313772
Dec 24-Dec 303363366841713640

The Northeast generally seems to be better about reporting deaths on holidays and weekends, so the relative increase here is likely exaggerated, but also likely real. The Midwest drop likewise is too large to not be largely a function of reporting, but also too large to purely be reporting. Things peaked there some time ago.

Positive Test Percentages

10/29 to 11/44.28%12.79%8.86%7.04%
11/5 to 11/115.56%17.51%9.89%8.31%
11/12 to 11/186.99%18.90%11.64%10.66%
11/19 to 11/257.00%16.62%10.41%11.75%
11/26 to 12/28.38%17.90%12.45%12.79%
12/3 to 12/910.47%17.94%13.70%12.76%
12/10 to 12/1610.15%15.63%15.91%13.65%
12/17 to 12/239.88%14.65%15.78%13.82%
12/24 to 12/3010.65%14.54%17.07%12.90%

Like everything else, interpreting these numbers is weird, especially given this for the whole country:

Date%+ Today

Presumably there’s a lot of time shifting there, but there are also alternative interpretations. One of them is Christmas was really bad, and that the last two days are largely real and quite ugly. We’ll know soon enough, it felt necessary to flag it, despite the general rule that one day of data tells you nothing.

Positive Tests

Nov 5-Nov 11157495387071206380108581
Nov 12-Nov 18211222452265255637150724
Nov 19-Nov 25269230435688294230170595
Nov 26-Dec 2256629357102294734185087
Dec 3-Dec 9354397379823368596263886
Dec 10-Dec 16415220315304406353260863
Dec 17-Dec 23439493271825419230236264
Dec 24-Dec 30372095206671373086225476

Included for completeness more than anything else. Christmas is exactly the time not to take such numbers too seriously. 

Test Counts

DateUSA testsPositive %NY testsPositive %Cumulative Positives
Oct 22-Oct 286,943,4707.5%890,1851.4%2.67%
Oct 29-Nov 47,349,6489.5%973,7771.6%2.89%
Nov 5-Nov 118,285,87810.7%1,059,5592.4%3.16%
Nov 12-Nov 189,033,62112.4%1,155,6702.9%3.50%
Nov 19-Nov 2510,415,39311.8%1,373,7512.9%3.87%
Nov 26-Dec 29,741,05711.7%1,287,0104.0%4.22%
Dec 3-Dec 910,458,64413.9%1,411,1424.9%4.66%
Dec 10-Dec 1610,694,84513.8%1,444,7254.9%5.11%
Dec 17-Dec 2310,710,35613.7%1,440,7705.1%5.56%
Dec 24-Dec 309,089,69213.8%1,303,2866.0%5.94%

Covid Machine Learning Project

Up to 20.3% estimated cumulative infections by December 16, up from 19.2% as of December 9 last week, which the model still believes. Most interestingly, a report that R0 has dropped to 0.9, and things are improving for now, with infections already down almost 20% from peak. 


One of these lines on that second graph is not like the others. It’s been about three weeks since the ramp-up began, so deaths should follow this coming week. If the new strain is less deadly, we’ll get the good news that way. But all of this is still distorted by Christmas, and hard to count on too much. 

The English Strain: Are We F***ed? Is it Over?

Yeah, probably. Sure looks like it. 

The twin central points last were that we were probably facing a much more infectious strain (70%), and that if we are fucked in this way, then it is effectively already over in the sense that our prevention efforts would be in vain. 

I remain highly confident in the second claim, if the increased infectiousness is sufficiently strong. We are dealing with exponential growth, and a race condition with vaccinations and prior infections, and also looking to move into the spring and summer, so as I thought last week, I remain confident that we can probably mostly muddle through if there is small increased infectiousness (up to about 35%), at 50% I am highly skeptical we can stop this, and at 65% it’s (probably) already over. 

For the first claim, my 70% probability from last week for the new strain being >50% more infectious is now 80%.

There’s also the open question of the extent to which the new strain is already circulating elsewhere. We know the strain has spread, but different orders of magnitude of existing spread are weeks different in their implications for the timeline. 

The question is, how do we gather more evidence to differentiate between the various scenarios? What evidence should we look for, and how much should we update on that evidence? I started a LessWrong question thread for that, as their software is good for that use case.

Metaculus has a market up, although it asks about a relatively small threshold:

Ten million worldwide is not that much, and could easily represent a success case in the United States. This question is mostly asking “Is there a new strain that is >30% more transmissible?” Their probability of 90% reflects that, and seems fully consistent with a 70% chance of >50% more transmissible. I think we have seen enough that I strongly agree with Metaculus here that the chance of a >30% more infectious strain is very high. The more interesting question is how that translates to the chances for a >50% or >65% more infectious strain. 

Metaculus also has some (entirely unsurprising) updates on spread, confirming that containment will not be a thing:

Meanwhile, in terms of how it’s going, British tourists sneak out of ski resorts to avoid retroactive quarantines. 

There is still time to actually try, if one wants, though, and in some cases a non-zero chance…

Which one could contrast with this, which I do think is a slightly unfair metaphor:

Juan Cambeiro’s Twitter thread on his reasoning on this question is here, it’s long with lots of sources, pictures and reasoning, and here’s the conclusion, with numbers similar to but slightly more skeptical than my initial estimate:

Via that same page, Tom Wenseleers comes in (Twitter) with a new analysis (GitHub):

This preprint model via the LessWrong thread has a confidence interval for increased infectiousness of 50%-74%.

I found this thread informative, link to original document here:

I quote the whole thing because the end points to the newest Very Serious Person line, which is to become Very Concerned about further mutation, or even vaccine escape, and using that as a reason to limit spread. It’s the latest thing. 

The reversed splits for hospitalizations and deaths in the two groups is weird, but presumably mostly random, as Kai concludes, and the big data point is that they looked at contacts for over a thousand cases, and 15.1% of contacts of the new strain became cases, versus 9.8% of contacts of the old strain became cases. That seems like a very good way to measure infectiousness. If there is a way for this to be random chance, I can’t think of a mechanism. There’s some chance those contacts became cases through other sources than the original contact, so if anything that ratio is probably an underestimate of increased infectiousness.

There’s a cool map here, but it’s hard to interact with. 

This report came out on the 31st, and I haven’t had time to check if it is a duplicate or for details, but it looks like it’s giving a range of 40%-80% more infectious (Twitter source). 

I checked the Good Judgment project but none of their markets seem to interact much with the question. I’ve also noticed a lot of their predictions are highly questionable. They are especially prone to wild swings of overconfidence, especially in political questions, and at least one current prediction on that page seems like it’s very, very wrong as of when I wrote this section, but I don’t want to go off topic so I won’t say more.

On December 29, the variant was found in the United States for the first time, in a Colorado man in his 20s who works at a nursing home (which is in turn a reminder that our failure to administer the vaccine quickly is going to cost many lives) and has no history of travel. So we have proof of community spread. The next day, health officials say they have found a second suspected case. It seems all but certain there are many people with the strain already in the United States. The question that will help determine our resulting timeline is, are we talking about hundreds, thousands or tens of thousands? 

On December 30, the variant was also found in California. This wasn’t unexpected or anything, but finding it in multiple places this quickly is very much not a good sign. 

So far I’ve seen two attempts at an estimate. The first comes from CNN. Note this headline’s date for one guess, remembering that the doubling time is plausibly around one week, and the generally conservative nature of such estimates:

It includes this helpful information (as of Dec 22):

Since November 15 — about the time the UK variant might have arrived in the US — genetic sequencing has been done on viruses found in about 300 people in the United States and in about 9,000 in the UK, Worobey said.

So that’s about 60 per week. So we’re looking at about maybe 150 sequences done since the UK made its announcement, and two of them have the new strain?

The other attempt is from Twitter. We have this, from before the California case:

This is the link from that Tweet.

Together with this, again before California:

The implication there is that the above calculations are wrong because the Colorado case wasn’t a random instance of sequencing finding the new strain, rather it was identified another way, so the denominator is unknown. 

I do think 50% detection is too high. I don’t know the right way to adjust for the detection method. I also don’t think you can use the month of December as a baseline without a lot of adjustment, since the new strain is suspected of doubling in comparative weight every week not counting imports of new cases, which would also be doubling.

It seems likely we are looking at hundreds or low thousands, perhaps mid thousands, which puts the most likely start of the endgame some time in March if current trends continue and infectiousness is the full amount we suspect.

I think the evidence this past week has strongly favored the new strain being more infectious. What we lack is the knock-down info that would differentiate 50% more infectious from 65% more infectious, to the extent such distinctions are meaningful. My old 70% number may have been premature and therefore somewhat too high, based on others’ evaluations of the same evidence I had at the time, but it now is clearly too low. I’m definitely at least as high as Metaculus, so 90% chance it is 30%+ more infectious, and I’d say 80% chance of 50%+ more infectious. 

But What Do We Do Now?

There are, by now, many good faith attempts to think about how likely it is that the new strain is more infectious, or figure out how much more infectious it is. Some of them are in the previous section.

The real problem comes after that. If you are someone who has concluded that the new strain is more infectious, what do you do now? What do you tell people to do?

You have to game out what actually happens from here, and figure out what makes sense and would help, either on an individual level or as a group. I did my best to start that discussion last week, and at least some readers clearly got it.

It seems that everyone who concluded that the new strain is more infectious, but that didn’t directly interact with that post, at least among the people that I can find, instead uses one of two  different algorithms

  1. That the new strain is Bad News and Very Concerning, and you should therefore be more concerned and do more prevention, while awaiting more info, like so:

With the more reasonable version of this being “we really really really should do everything to speed up our vaccinations, everyone, and to focus them on those most likely to die of Covid-19.” That’s certainly part of the correct answer, and likely the most important one for us as a group.

On an individual level, however, this is exactly backwards. If you are going to face much more danger in the future than you expected, then that’s a reason to care less about whether you get it now. In the extreme case, if the hospitals may be overloaded in the future while most people get infected at some point, getting it now so you’re immune later might not even be the worst trade.

  1. The other attitude is to exactly echo a year ago, and say there is no cause for concern and try to get people not to “panic” or something. Repeat the messaging of last February, so we can get a repeat of last February. And March and April. 

That’s exactly the mistake. If the new strain is much more infectious there, it’s much more infectious everywhere, it will soon be everywhere, and now is the time to worry. Everywhere.  

Don’t take his word for it, the WHO is re-running its greatest hit of all:

As Jacob puts it:

So. Yeah.

There’s also this bad take, which I think is bad but which is interestingly wrong, and actually an attempt at a real take, and I do agree with it not being the end of the world:

If we’re doing math, a 50% more infectious strain lowers the herd vulnerability threshold by a third, so if you think we needed 80% before, we’d need 87% now, and the percentage checks out. That’s not the mistake. The mistake is not counting all the extra infections, or the extra extent to which things are ‘hard’ before then if we’re not looking at tons of extra infections, or the way things are hard in other ways if we do get those infections.

In the scenario where our vaccination timeline is a constant and can’t be accelerated, but the control system can somehow adjust infection levels perfectly without inflicting any additional pain, then it’s plausible to say the new variant delays things a month but otherwise changes little. That doesn’t seem plausible to me. If the control system somehow does hold, it means we did a massively expensive crackdown where ‘hard’ is not an adequate description, and one month doesn’t cover it either, since at 5-10% towards an 80%+ target we’d need to be there for half a year or more. 

The baseline scenario remains, in my mind, that the variant takes over some time in early spring, the control system kicks in as a function of hospitalizations and deaths so with several weeks lag, and likely it runs out of power before it stabilizes things at all, and we blow past herd immunity relatively quickly combining that with our vaccination efforts. 

And yes, I know, I thought early on that either that or suppression would happen last time and I was wrong about it, because I vastly underestimated the power of control systems, and of the two week time horizon of all the politicians, and in general my insufficient amount of cynicism. So it’s quite possible I’m making that same mistake again, and we’re going to make the same mistakes again, even if I can’t actually imagine physically how we pull that off. Nothing is impossible if you have heart. Whatever else you think of these forces, they sure have heart.

Despite that, the conclusion still mostly seems robust, because of several factors. I’ve had a few conversations where it was clear I hadn’t made them sufficiently explicit, so I’ll do that now.

  1. The Control System Acts on Lagged Observations

A fully anticipatory control system wouldn’t have various waves, it would look mostly like straight lines and smooth curves. It’s also not how we observe people talking, acting or reacting, either politicians or private citizens. 

Private citizens seem to adjust their behavior to some combination of authoritative messaging, regulatory changes (government interventions), infections, hospitalizations and deaths. Those factors are lagged, and the reaction to them is lagged further still as these reactions are partly accumulative over time and news takes time to travel. Thus, you see waves, often reversing direction quickly once they peak. If you don’t count government restrictions, my model says people are mostly looking at deaths and hospitalizations, with a large share for local anecdotal observations. Their family, their friends, and people they know, and the local hospital, with some role for state and national statistics and news as well. 

What happens when the new strain moves in, if it’s fully 65% more infectious (which again means doubling its relative size every week, since each cycle is 5 days)? The growth rate starts to increase slowly, then rapidly. If we index by saying that Week 1 the new strain is 10% of infections and no one’s noticed a change yet, in Week 3 it’s over a third, and in Week 4 it’s the majority. By the time the control system notices the extent of the problem, it’s Week 6-8, and cases are up an order of magnitude or more.

  1. The Control System Is Largely Out of Ammunition

There is no more dakka. I could be wrong about this one, but I don’t see the knobs left to turn that people are still willing to turn. Look at England’s Tier 4, now extended to more areas. I had some harsh words for many of its choices, but do you see them introducing or even seriously considering a Tier 5, or changing their rules to be stricter? I don’t either. 

In terms of restrictions, we can’t work any harder than people needing an excuse to be outside. No one will listen, and there’s no way to enforce the rules when they refuse. Even if we could enforce it, the economic and social fallout would be extreme. I can’t even see us having the ability to do this for weeks, let alone months.  

In terms of private citizens taking action, there are some people who can be convinced to make one final push to isolate, but those people are being cautious enough already that this change won’t matter much. A lot of the rest of the people are effectively done with and over the whole thing, and I doubt they’d react much at all short of hospital overwhelm. Already hospitals are on the brink, with lots of cases and deaths, and we are seeing the behaviors we see. Good enough for slow improvement, but nothing more than that. Where is the sustained extra 30% cut in risk going to come from?

What we see is a gradual decay in willingness to distance and protect. 

We can only work smarter, and I see very little sign we are willing or able to do that. I’d love to be in the world where this new strain causes us to lift restrictions on testing, or on experiments, or even gets us to seriously accelerate vaccinations, and worry more about how fast we go than who gets it first or doesn’t want it. We don’t seem to live in that world, but we might see some movement on vaccination, although I’d expect it only to happen after we see the curves going up quickly again. Given how the timing works, that will be too late.

  1. The Crisis Will Beat the Heat and Outrace the Vaccinations

Another hope is that spring and its warm weather will help to save us, or that we’ll have enough people vaccinated by the time the crisis hits. The vaccinations will help. They might help quite a lot! Nursing homes could be mostly protected, cutting deaths by a third. If we prioritized age after that, we could almost certainly cut down the IFR by more than half before the crisis, perhaps substantially more than that, depending on timing and how much we get our act together.

The problem is that the new strain is already here, detected in multiple states and a lot of countries, so we’re already looking at hundreds of cases minimum. Exponential growth won’t be pretty from there. Unless this isn’t as infectious as it looks, we don’t have the time.

  1. Control System is Reacting to Levels 

Along with other factors, people are reacting to current levels of hospitalizations, deaths and infections, in some combination. There is some function that maps from those levels to a level of caution. 

In order to stabilize infections, and therefore everything else, we’ll need much stronger reactions than before. In order to get those stronger reactions, and sustain them, we’d need to stabilize at a much higher level of infection than now. 

Thus, even if we are in the scenario where we have the ammunition, and we can stabilize, we would stabilize well above 200,000 confirmed infections a day. If we cut the IFR through vaccination, then the control system will notice the relative lack of deaths (and presumably hospitalizations too) and thus stabilize at even more infections than that. That’s the best case scenario.

I think those are the core components of my model that I wasn’t being explicit enough about.

England Approves AstraZeneca Vaccine

This is excellent news, here’s a thread with some details, but hearings weren’t open so we didn’t learn much about their thinking. America should follow suit, but won’t do so any time soon. You see:

 Slaoui said that while the AstraZeneca vaccine appears very effective against severe disease, its efficacy among elderly people is “effectively unknown” because few older people were enrolled early in the trial. He said that remains his biggest question about the company’s shot, given the virus’ impact on elderly people.

U.S. regulators need more evidence: The drugmaker has said that the combined results showed 70 percent efficacy, but Slaoui suggested that U.S. regulators would not be satisfied by that conclusion.

“As far as the American people are concerned, I think it’s important to say one vaccine has 95 percent efficacy, another vaccine has X percent, whatever that number,” Slaoui told reporters, referring to the high efficacy rates for the Pfizer and BioNTech and Moderna vaccines that the FDA has authorized. “We need a clear and concrete number more than a number that is accumulated by adding together different trials with different schedules and different materials.”

Slaoui also questioned Britain’s dosing strategy. He said it’s possible a booster shot can be more effective when administered months later, but he said that the U.K. decision was based on theory rather evidence.

“It’s important, I think, to use the vaccine based on how you studied it,” he said.

Emphasis mine. The important thing, it seems, is to know the exact value of X.

I would be totally fine given the alternatives, by the way, if we actually are worried about effectiveness in the elderly, with giving the  less effective AstraZeneca vaccine to non-healthcare essential workers, who need it less and where we know it will work, while we give the Pfizer and Moderna vaccines to the elderly, almost as if I was trying to solve a physical problem. 

If there is one discrete thing that could make a real difference before the new strain hits us, besides actually vaccinating people with what vaccines we have (seriously, can we just pay 10 times as much to the doctors that do it, and if not then show your work), that could still possibly happen, it likely would be getting the AstraZeneca vaccine approved in time to speed things alone. If you have any way to move that needle, please do so, or let us know now to do so.

Two Dose, One Dose, Who Knows, You Knows

As pointed out by many, giving fewer people two doses of vaccine, rather than giving more people one dose of vaccine, when the second option is easier and quicker, and one dose is much more than half as effective as two doses, is rather insane, especially if it means holding half our doses in reserve unused rather than use newly delivered doses for that. Yes, it may make sense to give especially vulnerable or crucial people two doses anyway, but universal two-dosing is hugely destructive.

The good news is there’s considerable movement on this front, despite all the incentives and regulatory barriers.

Canada is doing a non-zero amount of one-dosing, or at least not holding supply back, and letting future deliveries be used for all second doses.

Tony Blair comes out in support of vaccine one dosing. As MR points out, no one is willing to do a cost-benefit analysis, because the result is utterly obvious. The whole point of our regulatory and “ethical” apparatus can be thought of as justification for not doing a cost-benefit analysis. Meanwhile, the one-dose plan is called ‘risky’ because such people think or risk purely in terms of either blameworthiness or in terms of changes from a given baseline scenario. All the people who will die because you two-dosed don’t count towards ‘risk’ in this philosophy, because they’re already going to die, because the ethical guidelines already said that’s what we are going to do, checkmate.

Blair also warns of a future of ‘vaccine passports’ required for travel, with article speculation they could spread to almost everything. I am almost certain such requirements are an almost purely a method of coercion to force people to get vaccinated when they don’t want to, and a means to punish those who refuse. But the requirement sounds so superficially like they’d work as a Sacrifice to the Gods that all opposition seems forced to cite ‘privacy’ concerns rather than raising the question of whether the requirements do anything beyond coercion and punishment. To ask that question, of course, would (among many other things) indicate you are opposed to such coercion.

Only a few days after Blair came out in favor, with every “ethicist” and “expert” calling his proposal crazy as per usual, the United Kingdom is actually doing it. At least to some extent:

This thread has some more details.

There’s also this problem, as always incentives matter:

All I Want For Christmas is a Covid Vaccine, But They Somehow Underpriced Them So Much No One’s Even Bothering To Sell Out

Despite everything, when it came to vaccinating people, I was still insufficiently cynical! The struggle is real. 

Your scientists were so preoccupied with whether or not they should, they didn’t stop to think if they could.

Welcome to America’s (and everywhere in the world except maybe Israel’s) Rollout Disaster. We have placed so much emphasis on the priority order, and so little on the logistics and incentives involved and on actually vaccinating anyone at all, that we’re on pace to let many doses sit on the shelves long enough to spoil.

How about in Canada?

That seems exactly backwards. This reveals priorities.

How is the English vaccination effort going? On the plus side, they’ve approved the Oxford vaccine. That’s super important, and it’s rather terrible that America isn’t following suit.

Otherwise? The way you would expect at this point, similar to America’s, with no sense of urgency.

Again, let’s reveal some priorities:

How about in the United States?

Marginal Revolution reports via this dashboard, As of February 29: Latest CDC vaccine distribution and administration numbers are out. 

Doses Distributed: 11,445,175 Doses Administered: 2,127,143 18.6% of the doses distributed have been administered.

Those numbers are even more obviously vastly incomplete than our usual standards, which we know because I have it on very good information (as in, from people who got vaccinated) that the number of vaccinations are happening in places reporting zero vaccinations. 

There is one reason for at least some hope, which is that a lot of this could be some combination of Christmas holidays screwing everything up and needing to start things ramping up, and perhaps things will pick up in January, and the slow start won’t end up mattering much so long as not that many doses get spoiled or given to random people to avoid them spoiling:

The video at the source starts with a woman saying, and I quote, “All I want for Christmas is a Covid vaccine” and then she randomly got one. I guess I’ll keep saying it. You never know.

I do think it’s plausible, and we’ll certainly see some amount of pickup in pace, but getting back on track is not the scenario I’m expecting.

Meanwhile, Actual Worst Person Andrew Cuomo has his priorities straight, focusing his fury on those who managed to vaccinate people and threatening not only the doctors involved but the patients who got the vaccine with criminal liability for jumping the line, while most of the doses sit on shelves unused.

But good news, everyone! We are getting ‘coordinators.’ 

In most places it looks like we haven’t even started letting our actual pharmaceutical distribution system start its work on nursing home residents. We have lots of drug stores. In some places, we plausibly have way too many in ways I’ve been long meaning to explore, so they can hijack business from each other. If we don’t want to let them charge money and also don’t want to pay them, but they still want to do the job anyway as a public service, we could at least let them do their jobs anyway.

So You’ve Decided To Lie to the American People

Dr. Fauci stands out among our most visible health ‘experts’ and officials, and others with influence. 

Most talk from such people takes place at Simulacra Level 3+ and is about blame avoidance, group signaling, politics and power.

Dr. Fauci is having none of that, and has firmly made his stand on Simulacra Level 2. His goal at least seems to be to give others a physical model of the world that will cause them to act in a way that makes the physical world better. He also seems to have a meaningfully better grasp of the physical situation, and its gears, than most others who are prominent. 

As the one prominent person who is willing to lie to us for our own good rather than lie to us because they are saying the thing one’s political intuition says to say in a situation, he stands as a paragon of relative integrity.

In other ‘better than the alternatives but not exactly the droids we are looking for’ profiles in… something, Kerry notes this quote:

I admit that my first best philosophical sources on which to base public policy are not the criminal protagonists of novels about Mafia families. Despite that, I for one will take arms-length transactionalism over our current standard practices any day. 

I leave it as a discussion question what would have happened if Don Coleone was in charge of the pandemic response. 

None of this is an ideal situation, and it puts everyone in a tricky spot when he joins 2020 and says the quiet part out loud. Last quote via Marginal Revolution

Recently, a figure to whom millions of Americans look for guidance — Dr. Anthony S. Fauci, an adviser to both the Trump administration and the incoming Biden administration — has begun incrementally raising his herd-immunity estimate.

In the pandemic’s early days, Dr. Fauci tended to cite the same 60 to 70 percent estimate that most experts did. About a month ago, he began saying “70, 75 percent” in television interviews. And last week, in an interview with CNBC News, he said “75, 80, 85 percent” and “75 to 80-plus percent.”

In a telephone interview the next day, Dr. Fauci acknowledged that he had slowly but deliberately been moving the goal posts. He is doing so, he said, partly based on new science, and partly on his gut feeling that the country is finally ready to hear what he really thinks.

Hard as it may be to hear, he said, he believes that it may take close to 90 percent immunity to bring the virus to a halt — almost as much as is needed to stop a measles outbreak.

Asked about Dr. Fauci’s conclusions, prominent epidemiologists said that he might be proven right…

Dr. Fauci said that weeks ago, he had hesitated to publicly raise his estimate because many Americans seemed hesitant about vaccines, which they would need to accept almost universally in order for the country to achieve herd immunity.

I have no idea if this is smart or dumb messaging, if you disregard the whole lying aspect and the price to be paid for that. It seems like the idea was, we want the maximum amount of prevention, both vaccinations and otherwise. We don’t want to aim too high because then people will despair and give up, and not do enough prevention, but we also don’t want to aim too low because then people will rejoice and not do enough prevention? 

My guess is that purely in terms of messaging to get more prevention you want to send the message that the threshold is relatively low. That makes people feel more hope that they can hold out long enough, and makes them feel like taking their vaccine shot helps more? Then of course you can spring on them later the whole ‘herd immunity is non-binary and complex and slow-acting’ thing, or eventually change which definition you’re using. 

Claiming close to 90 percent immunity is necessary seems both like terrible messaging, and also not a plausible lie. The number does not make sense. At best it means some super-threshold where you would never see a temporary flare-up. 

As lawyers famously ask witnesses, so, were you lying then, or are you lying now? Why should we trust anything you say?

The answer is that he’s both lying and not lying the whole time. He’s saying the answer he thinks will have the best effect on people’s models and thus on their behaviors, in terms of getting them to do the preventative things he wants them to do. That includes a requirement to maintain credibility, and thus not stray too far from what other ‘experts’ say. But beyond that, it doesn’t matter to him what the real number is, and since the definition of herd immunity is (shall we say, see the WHO policy change below) ‘flexible’, it’s not even clear there’s a right or wrong answer here. 

Dr. Fauci probably has a true belief for the distribution of possible values for the herd immunity threshold, or at least a best point estimate, but within the range of plausible values for his estimate, that value is not going to impact his stated answer at all. He’s ‘nudging up a bit’ without regard to whether he thinks that makes it more or less accurate.

I do have the instinct that when someone comes out and admits previous lying they’re usually telling the truth about that and their previous statement was the lie, and the current version is more likely to be truthful than the old one. I don’t know if that instinct is good, or whether it applies at all to this case. 

To be clear, thank you Dr. Fauci for saying this explicitly. Blatant lies are the best kind! Now, even more than earlier after the whole thing where he and everyone else lied to us about masks, we know what we are dealing with. But it’s a bad look, ya know? And if anything you seem proud of the whole idea rather than treating it as regretful while arguing it was necessary, or something similar. 

Which leads to reactions like this:

The W.H.O. is also playing fast and loose with herd immunity, here’s a good catch by CarellaJoe:

In June, you were immune no matter why you were immune. In November, only immunity from the vaccine counts. 

This matters. The consequences include vaccinating people who are already immune because they’ve already had Covid-19. Including still giving them priority, and even making it mandatory for many of them, and then giving them an even more useless second vaccine dose.

In general, the new definition is less useful and fails to cut reality at its joints. This is not where to draw the boundaries. The new one was chosen in order to drive rhetoric. 

In light of all that, here’s an interview of Dr. Fauci on Podcast-19 in which he delivers his message. How much of it to believe is up to you. There isn’t any concrete new info here. His response to the new English strain is, of course, reassurance combined with general need for concern, but he was only asked about its impact on vaccinations. 

Vaccine Allocation By Politics and Power

You expected allocation via politics and power to mostly be fair, and you never thought the leopards would eat your face, aw, that’s cute:

Essential sectors like… finance. 

I am not as curious about this one as Olivia. 

Here’s New York’s priority list, which looks relatively sane and fair given the decision to kill off a bunch of old people:

Expect a lot of very interesting definitions of both ‘regular interaction with the public’ and ‘essential’ in the coming months.

Also, here’s one part of how Cuomo is interpreting that order in practice:

There are plausible utility functions where addicts in rehab could get relatively high priority, but I am confident they are not anything the public would take kindly to let alone endorse or see as “fair.” 

Here’s Massachusetts:

Each of those dots is in order of priority so expect massive delays as we pause to clear each step before starting the next one.

Even when you do offer the vaccine to the right people, they’re not the ones who want it…

Also worth noting that if you have two reasons to vaccinate someone first, increased risk of infection (whether or not only virtuous risk counts) and increased risk of death given infection, you might consider doing the obvious, and you could even shut up and multiply to get risk of death.

Complexity is bad, but we’re doing other complex things in the name of politics and power, so if we’re doing both of these things anyway then there’s much less excuse for not even mentioning this option.

Via this twitter thread, more detail on how the CDC decided that racial ‘equity’ was important enough to choose plans that killed more people rather than less people. As a reminder, the argument is that elderly people are disproportionately white, so giving the vaccine to elderly people first is racist.  

If you oppose such priorities, it does not seem that we are out of the woods on this:

Marcella Nunez-Smith, a co-chair of Joe Biden’s COVID-19 advisory board, commended the experts at the CDC for “taking political interference out of the process” and for “their grounding in inequity.”

In addition to the central argument that it’s better to kill more people so that deaths are distributed ‘equitably’, there’s this gem that’s worth pondering:

One graphic from Oliver’s presentation, used to illustrate the trade-offs of prioritizing the elderly, cites a statement from the American Geriatric Society that “age should never be used to exclude someone from a standard of care, nor should age ‘cut-offs’ be used” to allocate scarce supplies. It also notes that the Health and Human Services Office for Civil Rights had objected to triaging ventilators by age at the start of the pandemic.

Regardless of how you value ‘equity’ versus ‘people not dying’ it is interesting to decide for yourself whether this is an immensely dishonest use of that quote, or if it is instead completely fair. 

Obviously the American Geriatric Society was arguing against discrimination against the elderly. The quote was originally in the context of ventilator allocation. 

But what is the principle here? 

Is it exactly what was said, that “age should never be used to exclude someone from a standard of care, nor should age ‘cut-offs’ be used to allocate scarce supplies?”

Or is this one of those one-sided anti-discrimination principles, where you can never favor young over old for any reason, but you can favor old over young all you want? There do seem to be a bunch of these going around lately. In general, if one wants to say that you can favor group X over group Y, but never group Y over group X, you should say that, rather than say “never favor one group over another group.” 

In the spirit of blatant lies are the best kind, and rewarding the creation of clarity, I do want to thank the advocates of such policies for their honesty and transparency. Whatever else one might think of such priorities, they had the courage to openly admit what they were, and not to attempt to fudge the predictions that such actions would result in more people dying. And also they did not pretend they were deciding on some other ethical principle or practical advantage, despite reasonable arguments being available. They could have said that those out there volunteering to take risk deserve our protection, or had considerations of efficiency and reliability of service provision, the same way that it’s a great relief to know that the health care workers are vaccinated when you yourself might need their care. Instead, they went with their true objection. We should applaud that.

In other vaccines allocated via power and politics news, did you know that if you pay very little money for something, you often get less of it?

I am a physician in private practice in [redacted]. We have just been approved to order and administer the vaccine to tier-appropriate patients. Medicare has approved a payment of 18$ for the first shot and 28$ for the second. As far as we can determine we will not be allowed to bill for an office visit so that is the entire amount we will receive for registering the patients, screening then for covid outside of the office, taking their vital signs, taking a history to see if there are any contraindications to the vaccine, administering the vaccine, observing them in the clinic for a minimum of 15 minutes up to 30 minutes depending on their history, and recalling them in 28 days and going through most of the same procedure again, minus the registration and history. There is also an extensive regime of recording and reporting all vaccination data daily to the state government. We had anticipated hiring someone to manage this new service due to the amount of new work that is required. At this rate we might be able to give 10 shots an hour in each of our 3 clinics if we see no other patients for illness, injury, or covid testing.

Do I need to say that we cannot possibly afford to do this for the reimbursement offered. The alternative is for patients to receive the vaccine in some state funded site or clinic. That may take a very long time to roll out.

It’s one thing to not charge the patient. I get that. But to not sustainably compensate the doctor? What was the plan here?

Israel has a better plan, which includes: Vaccinate 24/7:

Health Minister Yuli Edelstein called Thursday to keep the vaccine operation going 24 hours a day, 7 days a week, including on Shabbat.

Regarding the push to carry out vaccinations on Shabbat, Edelstein, who is Orthodox, cited the Jewish legal principle of saving a life, or “pikuah nefesh,” which trumps nearly all other religious requirements.

According to a Channel 12 report Saturday, Clalit, Israel’s largest health maintenance organization, will open 24/7 vaccination centers in Tel Aviv, Haifa and Herzliya in the coming days to help ramp up the pace of the vaccine drive. Additional centers are expected to be opened at a later date.

Israeli hospitals are also to join the vaccination effort next week, and hundreds of IDF medics will also participate, to help expedite the process.

For comparison, NYC vaccinations by day, where the city that never sleeps seems to at least be snoozing every so often:

One country thinks saving lives is the highest obligation of us all, including as a religious obligation. The other pays forty-six bucks and forbids charging anything additional.

If you don’t like allocation by politics and power, and you don’t want to allocate by willingness to pay, you can always take door number three, and allocate as Florida is doing among the elderly via willingness to stand in line. This way, instead of money being transferred, the competition is about who is willing to destroy the most value (via standing in a line that could get people infected, in the middle of winter, for many hours). It also means that the more vulnerable you are, the harder it is to get vaccinated. 

Still, Florida is prioritizing the elderly over the non-elderly, and prioritizing those willing to send a costly signal over those unwilling to send such a signal. I’m guessing this is still an upgrade over the realistic alternatives. I’d have been tempted to use this thing called ‘appointments’ but that would slow things down, and it’s plausible that even a small speed boost is more important than everything else. So overall, give my regards once again to Governor DeSantos.

There are always good arguments about people in charge not having that much control over events, but I still think Democracy works better when we give people the right incentives even if it means some unfair evaluations, and fully endorse this, adjusted for degree of difficulty:

From Bloomberg, 3 million doses known to be delivered as of morning of 12/31:

In Other News

Good Twitter thread from Youyang Gu of Covid Machine Learning Projections about why he thinks the CDC’s estimate that 100 million people in the USA were infected by December 1 is mistaken. Lots of meat to get into here and it’s the holidays, so I’m deciding not to have time for this week, but I hope to revisit next week.

If you’re wondering what the FDA was doing instead of approving Covid-19 vaccines, it was fighting the good fight against Bucatini, which is essentially spaghetti with a hole in it. At first it looked like this was because with all the restrictions and shortages people were using Bucatini as straws, but it’s a pre-cooked food and the FDA was worried this was unsafe and therefore put a hold on the product. But it turns out, it’s nothing as fun as that, it’s merely that the EU and USA have distinct requirements for the enrichment of flour and a rival pasta company tipped off the FDA that the pasta was meeting the wrong requirements, in order to gain a business advantage over their rival. Whether that’s a better or worse look for anyone involved is an open question.

But that’s not all. The FDA was also hard at work charging $14,060 fees for distilleries that produced badly needed hand sanitizer. Because now they are ‘drug manufacturing facilities.’ They take their status as President of the Delenda Est Club seriously. 

Washington Post piece on our early failures to provide a Covid-19 test, which Thailand deployed within 1 day, and which took any given private citizen 1 day with ordinary skill in the art plus any kind of lab to work with, but took the CDC 46 days while we banned all private efforts (Twitter HT). 

Yet another way we could test for Covid-19 and catch it before people become infectious, if that kind of thing were legal. They’re getting it approved to monitor insulin continuously, which is highly useful. Offhand, they mention that oh by the way it can detect a ton of other things too, including Covid-19. 

Imperial College in the UK is finally doing a challenge trial starting in January (hurray!) with results in May. Far too little, far too late, but it’s still a bargain at ten times the price, and hopefully it makes it easier to do such things next time.

Completely inessential and off-topic, but too good a headline to not share: Game Of Thrones Showrunners’ New Netflix Series On Hold After Suspected Murder

Matt Yglesias offers words of wisdom on the failures of our messaging about masks and other preventative measures, and especially how the early emphasis on dirty surfaces continues to focus people on all the wrong things. Even knowing surfaces don’t matter and telling people over and over surfaces don’t matter and knowing we all still pay too much attention to surfaces, I still pay too much attention to surfaces. 

I’ve said it before so You Should Know This Already, but a periodic reminder that the UK was paying people specifically for people to dine in at restaurants is still worthwhile. Did you know that people got to use the discount a fixed number of times, but it could be used on a dining party of any size?

Yes, the systems involved really are this perverse.

While some of us have been effectively put under house arrest by the pandemic (see the rest of the linked thread) this is your periodic reminder of how seriously many regular folk who think they are being responsible took all of this:

California’s pandemic response, summed up in one Tweet:

Good thing we are extending the order that few are following and that no one is enforcing. This is what passes these days for ‘rule of law.’

Off-topic spoiler-free review of Tenet: Four out of five stars, made perfect sense, ask me anything. But not here.


I want to thank everyone who took my warnings of last week seriously, and helped spread the word. We got a shout-out in Shtetl-Optimized, as he offers his “crackpot theory” that if we were a functional civilization we might have acted like one and vaccinated everyone a while ago. Also all those who looked into the information available, and decided for themselves how likely the new strain was to be various levels of infectious. What we most need more eyes and thoughts on, regarding the new strain, is figuring out how all of this plays out, and what we might do to change the outcome, either collectively or individually. 

It is super tricky to reason through the implications of the current situation. I still don’t know if one should buy stocks, sell stocks or do nothing. It’s not even obvious if one should be focused on taking more or less precautions. And I don’t see any careful thinking about the hardest part for me to figure out, which is what authorities are likely to do and how we might shift their thinking. I do not see people wrestling much with these questions.

We also have a vaccination crisis. WIth the new strain coming, getting as many people vaccinated as fast as possible becomes that much more important. Instead, we will be giving up on AstraZeneca until April, and are so bad at putting shots into arms now that we need to be worried about doses spoiling. Even after everything, I didn’t consider that we would botch things that badly. I figured it would cost lives if we administered vaccines later than we needed to, but supply would still mostly be the limiting factor, so mostly only supply would matter. Surely we wouldn’t be so terrible at this that we’d throw out millions of doses. 

And yet, here we are, and that has become a distinct possibility. Hopefully it will not come to pass, but it will have come scarily close. All we have to do is offer reasonable compensation to those tasked with putting shots into arms, and give those people shots to put into arms. At this point, I don’t even care that much which arms the shots get put into, relative to getting those shots into  some arms rather than no arms. 

If you know about any way at all to move that needle, please at least let others know how to do so. 

Few things would make me happier than to be wrong about all this. 

Finally, arbitrary cutoffs like December 31 still matter. Virtual party at the walled garden.I wish all of you a Happy New Year, whose first six months are nothing like the new year I expect. Whether or not the pandemic will be over soon, good riddance to 2020 is one thing we can all agree upon.

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40 Responses to Covid 12/31: Meet the New Year

  1. myst_05 says:

    Happy new year, Zvi! Hope to see the weekly posts continue up until the pandemic is over (hopefully in 2021).

    P.S. I’ve watched Tenet and I kind of disagree. Can we get a separate discussion post? :)

    • TheZvi says:

      If I’m writing these in 2022 I can’t even.

      I’ll consider finding a place for Tenet discussion, but certainly feel free to ask me casually some time.

  2. kronopath says:

    Your link to Youyang Gu’s Twitter thread instead links to the CDC article he was presumably commenting on.

  3. gavinobrown says:

    Thank you for doing this. It’s infuriating that this is where we are, but it’s good to at least understand what’s going on.

    Are there any concrete suggestions that could be given at the state or city level? It seems like the biggest issues at the moment are driven by FDA and other federal agencies. Could governors or mayors make any specific impactful changes at the moment?

    • TheZvi says:

      Governors certainly can, because states are in charge of vaccine distribution. In theory, a governor could run a pure first come, first serve, and also pay doctors more to do it, and get a lot more people vaccinated, if nothing else. Or do something less drastic with prioritization but very doable – e.g. make tier 1 include everyone over 65, so there’s plenty of people everywhere.

  4. J says:

    Re: surfaces, it looks to me like the virus does seem to persist on surfaces, and I’ve heard of a few cases of surface transmission in places with serious contact tracing. So I’m glad we’ve continued to quarantine packages and wash groceries, although most people seem to have a base risk level much higher than ours and thus less to gain.

    • J says:

      And BTW this study appears to have not simply looked for RNA fragments, which was a criticism of earlier work, since RNA might persist long after the lipid layer disintegrated, leaving the virus toothless. I didn’t totally follow their methodology, but it looked like they tested that their recovered samples could actually infect cells.

      Also, tldr: infectiousness seemed to decay about 90% in ~5 days at room temperature, and if you get just past 100F then you’re doing pretty great in under a day. Which makes me want to rig up an old fridge as a warming cabinet to reduce our package quarantine from a week to a day.

    • TheZvi says:

      “Heard of a few cases” seems like the right level of risk to consider here. Yes, I agree that fomite transmission is *possible*, such that it makes sense to wash hands, avoid touching face and generally not act like a moron. And if you were super high risk and/or wanted to otherwise take essentially actual zero risk, you’d do otherwise paranoid things like quarantining packages. But I think that for regular people the sanity and time costs involved are rather clearly not worthwhile.

  5. Another excellent article.

    I do feel like it was a bit confusing in a few places, where you were quoting something, but the quote was formatted the same way as the rest of the post. Even if you include a line in the previous paragraph that potentially implies a quote, I feel you are unnecessarily sacrificing some clarity. For example, before the quote you took from a physician you wrote this line.

    “In other vaccines allocated via power and politics news, did you know that if you pay very little money for something, you often get less of it?”

    You include a link and call it news, but do not explicitly say a quote will follow, and while it becomes very quickly clear that you are quoting someone, I admit it took me a few seconds longer to parse it. Which is certainly not a big deal, I think this article is still quite readable, but I think you can measurably increase the clarity of the post at almost literally zero cost, if you were to just add quotation marks before and after any written part of your article that is a quote from another source.

  6. Liam R says:

    This might be your best update so far. A gargantuan masterpiece. I found myself shaking my head in disbelief and agreement. Thank you, thank you, thank you.

  7. J says:

    The twitter thread under “I found this thread informative” cites 2 cases of reinfection out of <2000. This was quite concerning to me since I had been using your earlier rule of thumb of about 1 in a million cases of reinfection from a while back.

    A big part of our future sanity plan has been hanging out with people who've already had it, and more generally I've been assuming that when most of our friends have had it and are out partying, there will be a cascade where people stop being cautious because they don't want to be left out. Consequently I assume the warnings from Very Serious People about reinfection uncertainty are mainly to forestall this effect.

    Perhaps next time you could give us some thoughts on risk of hanging out with a covid victim as a function of time, including the increasing risk of reinfection as immunity wears off.

    • TheZvi says:

      I do see them citing higher amounts of reinfection, but 1 in 1000 cases being ‘reinfection’ versus a previous infection rate of 1 in 10 is still a 99% success rate. Don’t be in each other’s faces for no reason, sure, but I think at some point you gotta live your life.

      And that’s if those cases are legit. I still suspect that they usually or mostly involve false alarms, or people with very strange immune systems.

  8. J says:

    I was surprised to see the microcovid folks come out as unimpressed with rapid home testing.

    I was hanging a lot of hope on people who pass a rapid antigen test being pretty safe to socialize with for a few hours after the test (and had heard Fauci mention in passing that that’s how he hosts dinner parties). Their argument largely hinges on infectiousness peaking several days before minimum false negative rate, which seems surprising since it seems like infectiousness and test effectiveness should correlate really well, since both are a result of virus shedding.

    They even had a dim view of the sensitivity of PCR tests, which I had thought were too sensitive if anything. But perhaps there I’m confusing sensitivity as a function of concentration in the sample, and end-to-end sensitivity when you’re trying to pick stuff up with a swab.

    My spidey sense is that test sampling technique (nasopharyngeal swabs, etc.) is being under-optimized, such that people are getting brain-stabbed way more than is necessary and that there should be more reliable and less invasive ways to get better samples than we currently are. Eg., would swabbing your nose and then also swabbing the inside of your cheeks with the same swab be more likely to help than hurt?

    • TheZvi says:

      This feels like them mostly being overly paranoid, but yes I do agree that someone getting a negative test is not as strong evidence for them being non-infectious as one might like. I’d say it cuts down risk more than a third, but it’s not a 90%+ solution.

      • Bobe says:

        Where does your one third come from? Motivated by a family discussion, I put some effort into making an esteem, but gave up because I couldn’t find cycle threshold distribution of asymptomatic cases. If I recall correctly, the cycle threshold vs. infectivity function wasn’t hopeless, and the user guide of the test I have tells the cycle thresholds of false negatives (positive pcr, negative antigen test). That’s not much, but better than nothing.

  9. cgln says:

    Happy New Year!

    2020 was a bad year for people in general, but it was a pretty good year for me personally. I taught myself how to code (web stuff/python) and now I am finishing up the second draft of a historical fantasy novel, a Lovecraftian story about exile, a city tearing itself apart, and the promise of the fulfillment of all desire, set in 10th century Central Asia. Hopefully in 2021 I will be finishing up my undergrad and graduating with gainful employment.

    As far as Covid goes, do you think the same moderate personal precautions of the past few months (wearing a mask, getting tested, and limiting interactions, but still going outside and buying things in-person) will still suffice for the new strain?

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  11. mritter says:

    Can you give a more concrete sense of what the US looks like on the ground in your worst case scenario?

    • mritter says:

      To be a little more explicit: The rest of the post is vey quantitative but the conclusion feels vague as far as the impact on an average American

    • TheZvi says:

      Worst case scenario is either (A) government attempts a lockdown lasting several months, and Republicans refuse to allow further relief, and widespread ruination and economic depression ensue, or (B) we go from ~25% infected to ~75% infected over the course of 2 months, hospitals are overwhelmed and the death rate ends up 1%+ as a result. I don’t expect either of these to fully happen (e.g. B assumes the vulnerable weren’t vaccinated) but I think the baseline worry should be hospital overwhelm and widespread panic/shutdown for at least a short period.

  12. Brett Bellmore says:

    Personally I’m scheduled to donate blood this week, which will get me a free Covid 19 antibody test.

    Best case is I test positive, and somebody else can have my dose of vaccine. Worst case?

    I’ve donated blood.

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  14. Mitchell Powell says:

    When it comes to estimating the number of cases of Covid-UK in the US right now, here’s my best attempt. I have very little confidence that it’s in the right ballpark, but maybe folks here could let me know if there’s a better way to do this. Basically I’m multiplying two numbers: an estimate of what fraction of US cases are “S gene dropouts”, and then an estimate of what fraction of S gene dropouts are Covid-UK.

    I start with the Helix Research Team’s blog, at a post December 23rd (, where they report:

    “We observe a rise in S gene dropout starting in early October, with 0.25% of our daily COVID-19-positive tests exhibiting this pattern during the first week. The rate of positive samples with S gene dropout has grown slowly over time, with last week exhibiting the highest level yet at 0.5% of COVID-19-positive tests that are consistent with the H69del/V70del variant.”

    So, for the moment, let’s say there’s something like 0.5% of US Covid cases showing S gene dropout in December.

    Next, we can look at their testing of a subset of S gene dropout cases, in which they tested 31 cases and found Covid-UK in 4 of them (

    “Of the initial 31 samples with high quality sequencing data, four match the B.1.1.7 strain.”

    Now, ignoring for a moment any problems with how truly random any of these samples are, let’s multiply 0.5% by 4/31, and we get 0.065% of US Covid cases having the UK strain.

    Next, there’s the fact that those numbers seem to come from about mid-to-late December. Given a bit less than two weeks, and the previously observed pattern of the new B.1.1.7 strain doubling in prevalence about once a week in the UK, we can then gingerly work our way forward and say that perhaps 0.2% of new cases in the US as of the beginning of 2021 are Covid-UK.

    If that’s the case, we’re about 9 doublings away from Covid-UK reaching equal prevalence with Covid-Classic, and if it were to double once a week, that would result in things getting really hairy starting in early March.

    Now, I know that there are possible objections galore to the calculation that 0.2% of current US cases are of the B.1.1.7 strain. But is there a better way to calculate an estimate available at the moment?

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  18. silveryswift says:

    “The baseline scenario remains, in my mind, that the variant takes over some time in early spring, the control system kicks in as a function of hospitalizations and deaths so with several weeks lag, and likely it runs out of power before it stabilizes things at all, and we blow past herd immunity relatively quickly combining that with our vaccination efforts.”

    Do you have a best guess as to what ‘relatively quickly’ means here, are we likely to hit herd immunity in this scenario before (for instance) May?

    I mentally had marked September as my things-starting-to-go-fully-back-to-normal date, but reading this makes me think I should pull that forward.

    • TheZvi says:

      Did a quick sim if no control system (everyone keeps same behavior no matter what), no vaccine, previous R0 of 1 and 50% increased infectiousness of new strain. Peak is around April 25, around June 1 we’re at current infection rates, July 1 it’s 10% of that. We end with 64% infected.

      Question is how much control system, and how much vaccine. But the new peak is only 3x the old peak, so I’m guessing control system in many worlds doesn’t slow things that much on the way up? On the way down it does, but vaccines are a big help. I don’t know.

      Certainly you should be vaccinated by September 1, and enough people will be immune that many normal activities can resume well before then?

      • I appreciate this response, The elaboration of your model here is a few words yet I felt my perception of the situation seem clearer after reading it.

      • silveryswift says:

        Thanks! That helped a lot to make things clearer.

        September is what a lot of people around me are throwing around as the “realistic” date for when healthy people my age that won’t get priority for other reasons can get vaccinated around here (not living in the US).

        It might very well be overly pessimistic and it’s probably not actually based on any kind of gears level understanding of things, but I’ve pushed my estimated date for when this is over back so often that I’m now ok with being (what feels like) excessively pessimistic.

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  21. Erasmus says:

    Umm, you mention that Covid “survivors” maybe shouldn’t get the vaccine because….they have immunity. The “if you had it in June” comment. Do you have reliable information on the average length of immunity conferred by recovery from it? And whatever that is, isn’t it likely it will vary greatly from individual to individual? I’m reading a lot of opinions in various places about how Covid recovered people should go to the end of the line. What is the basis for this, if we don’t know the length and/or strength of conferred natural immunity?

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  23. Do you (or anyone) have any idea about the prospect of getting a hospital job to get the vaccine faster? I know a woman in her mid sixties who worked at a hospital not too long ago and could easily be rehired if asked. If that meant she could be vaccinated before being exposed to a high risk of catching Covid from the hospital environment, it sounds worth it to her. Obviously now is not the time, but could that be a path to faster vaccination for her in two to four months? Would that ever be a smart thing to do, or would it probably just raise the likelihood of infection before vaccination instead of lowering it? Does already being in her mid sixties mean waiting for the queue is definitely better? I’m not asking for authority, but this is a relevant matter for me and I’m trying to figure if there’s any logic to the idea.

  24. A fantastic write up there mate. Glad to see you’re enjoying a love of writing.

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