I use the 0.66% number myself when estimating things, but it's worth noting that that is that papers best-guess estimated infection fatality rate for China, bas

I use the 0.66% number myself when estimating things, but it's worth noting that that is that papers best-guess estimated infection fatality rate for China, based on its demographics. The paper has an overall estimate of the infection fatality rate for all ages of 0.2-1.6%.