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21 Dec, 5 tweets, 2 min read
Something interesting is happening in Europe: Population centers along the same latitude and region are seeing a rise starting exactly around December 3rd.

Any idea why? Anything these countries share aside from latitude? (1/x)
If it is the more infectious variant, as the UK claims, this would mean the variant is already widespread in those other countries as well.

However, I would not expect this to be the case, since the rise would be staggered rather than in concert if that were true. (2/x)
It cannot be human behavior either, as we have seen numerous times by now. The variance in human behavior is too big to cause such orchestrated moves, especially across borders.

Has there been any significant shift in weather in that area around after mid-November? (3/3)
ADDENDUM: If the rise in London is indeed environmental, it is possible that the new variant is not more infectious, but just happened to be discovered in the wrong place and the wrong time.

I believe the claims 70% more infectious are based on case rates in the area. (4/5)
Finally it is possible that both are correct, that this version somehow show a different seasonality pattern, and was already widespread in the region when the weather got right in late November. (5/5)

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More from @covidtweets

17 Dec
I believe that if we had spent 1% of the money we are burning on testing to supply everyone over 60 with enough N95s, and let the life to go on as normal, we would have max. 10% of the current mortality.

But we keep insisting on the wrong mode of transmission. (1/x)
We operate under a droplet model and do the things that should work, like masks, distance, contact tracing. None of those things work - as seen repeatedly since October.

Without any apparent change in human behavior, cases are skyrocketing. (2/x)
I wouldn't be surprised if we one day discover that this virus, like pollens, don't need droplets of any size (not even aerosols) to float in the air, at right temperatures/humidity. Like mold, it stays in the air, and infects when they find the right host environment. (3/x)
Read 10 tweets
6 Dec
COVID hospitalizations are breaking records, yet overall utilization seems relatively unchanged and mostly normal for this time of the year. How can this be?

How can hospitals both be overwhelmed but also have about the same number of beds available as a month ago? (1/x)
Let's say we randomly select a group of people from the population every day, and have them spend the night in a hospital. Of course they are not random, but that is not the point.

When there is more spread, more of the people who are selected each day will have it. (2/x)
Let's look at NC numbers. The situation is similar in many places.

COVID hospitalizations increased by about a thousand in the past month, but overall utilization is the same. How is this happening?

It is all about COVID unit capacity. (3/x)
Read 8 tweets
29 Nov
I am beginning to think that the widely accepted model of COVID mainly transmitting between close contacts via droplets is insufficient to explain the data and failing the Occam's razor. Instead, aerosols being the main route of transmission does better in both. (1/x)
Before I explain my reasoning, usual caveats: I am not a virologist/epidemiologist/medical professional/etc. I am just a scientist in another field who is observing the data and trying to make sense of it. So take the following with the usual grain of salt. (2/x)
First, what is Occam's razor? It means generally the theory which require the least number of assumptions is correct. A good example is geocentric vs. heliocentric models, the latter of which requires only one assumption - planets orbit the Sun. (3/x)
ImageImage
Read 13 tweets
23 Nov
Additional analysis on Kansas mask data: Does the size of the first wave (case levels before June) have an impact on the change in cases between August 11th - November 20th? (1/x)

Using population adjusted case numbers, below are the correlations between first wave cases, mask mandate, and change in cases after August. There is a significant negative correlation between first wave size and change after August. (2/x)
The correlation between masks and change is positive, meaning mandate counties had bigger changes. However, this is likely confounded by first wave size, as three counties with bigger first waves are non-mandate counties. (3/x)
Read 6 tweets
23 Nov
The new CDC study on mask effectiveness compares Kansas counties with and without mask mandates and finds that masks are effective.

Are they, really? (1/x)

cdc.gov/mmwr/volumes/6…
The first red flag comes from the data they used for analyses. They pick two seemingly random weeks from before and after the mandates and compare the changes in case numbers. They find that cases doubled in non-mandate counties and slightly declined in mandate counties. (2/x)
While this looks like cherry-picking, the results are actually similar when we compare mandate vs. non-mandate counties in terms of overall increase since August. On average, cases per 100K increased by x19 in non-mask counties vs. x9 in mask counties. (3/x)
Read 8 tweets
22 Nov
While it is too early for interventions to take effect in ND, I wanted to post an update regarding our quasi-experiment comparing SD/ND after ND implemented restrictions and mask mandates, effective Nov. 14th, and SD did not. (1/5)
First, cases: While ND is trending higher, both seem to have turned downward around the time ND implemented the mandates. No divergence so far. However, it is important to note that infections take around a week to be counted as a case, so any effect would not show yet. (2/5)
Second, hospitalizations: This also seems to have stabilized and turning downward in both states, although it is more pronounced in ND. (3/5)
Read 5 tweets

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