2/n If you look at the cases/deaths data from the US, it certainly seems true. Far MORE confirmed cases of COVID-19 in the second wave, but far FEWER deaths At first glance, looks like COVID-19 is getting less lethal!pic.twitter.com/M9IwnCFids
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12/n In particular, if I put the two graphs side-by-side, you can see how a TINY change in the proportion in older people being infected can lead to a HUGE numerical increase in deathspic.twitter.com/QUyfQQh9z7
13/n But broadly speaking, using this (again, VERY CRUDE) method, there appears to be little difference between waves 1 & 2 in the US It's simply that our testing changed, not that the disease itself was different
14/n Indeed, as you can see, the FIRST wave in the US PROBABLY HAD MORE CASES THAN THE SECOND despite having fewer confirmed casespic.twitter.com/20lUU4KuOR
15/n Interestingly, this also gives us a very crude number of total cases in the US roughly in line with @youyanggu's modelled estimates, with about 12-15% of the country infected by late September
16/n Another point - people have said that this is flawed because the IFR in the second wave is less than that of the first If you reduce the IFRs in the second wave by 35%, this is what the graph looks like. Still not very different!pic.twitter.com/cuE89EVxps
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