[salmon30salmon]

That’s part of the thesis of the article. Some populations mix more than others. In the mixing populations the threshold will be higher. In populations with limited mixing, lower.

20% of NYC can have the virus and the general level for herd immunity can still be what is postulated. NYC is incredibly dense compared to the rest of the USA and as such will naturally have more mixing and a higher threshold than say Topeka, Kansas

[xadhominemx]

The USA as a whole is already at ~10-15% and the rate of infections increased since late summer, and we are not even in flu season

[timr]

Just because the US average is X% doesn't mean that the every community in the whole country is X%. There's clearly heterogeneity in the data.

[xadhominemx]

Ok but I assume that is taken into account in your 15-20% estimate