In England, the proportion of people infected by the coronavirus who later died was certainly lower in early August than it was in late June. Over the period, this infection fatality rate (IFR) dropped by between 55 and 80 per cent, depending on which data set was used, found Jason Oke at the University of Oxford and his colleagues. [...]
Nonetheless, why this is happening isn’t so clear. According to data for England, a larger proportion of younger people are being infected than was happening around the first peak of cases in April, with cases rates for 10-16 August the highest among 15-44 year olds. [...]
The jury is out on whether one variant of the coronavirus, known as D614G, explains why covid-19 is becoming less deadly. Paul Tambyah at the National University of Singapore told Reuters that the rise of the D614G mutation had coincided with drops in death rates in some countries, suggesting that it might be “more infectious but less deadly”.
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