U.S. COVID-19 case fatality rate over time:
22 March: 1.3%
4 April: 2.7%
4 May: 5.8%
30 May: 5.8%
11 Jun (today): 5.6%
In a recent overview in the FT:
"The [IFR] depends on local circumstances but is typically in the 0.5 to 1% range. A study by Imperial College London of the epidemic in China found an IFR of 0.66 per cent. Meta-analysis by Australian epidemiologists who pulled together 25 studies around the world calculated that the average IFR was 0.64 per cent."
Way back in March Imperial College used an overall IFR of 0.9% for the purposes of their study. They stated that the 95% CI for this estimate was 0.4-1.4%.
Of course with limited testing, such as is happening in the US, the IFR of confirmed cases will be much higher. As you note, it has remained stubbornly high in the US.
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