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I think we should wait to make determinations on cause until we see if that changes once the weather turns in the north and Europe and people return to heated spaces.

If this was really a matter of herd immunity, Florida wouldn’t be getting hammered right now.

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Don't forget that idea is inverted for lots of the US (like Florida and Arizona). You gather indoors during the summer, in air conditioned spaces. Winter is when you're outside more often.

That is what underlies my point. Basically, I don’t think we can say that Europe or the northern US has this beat yet. It doesn’t. Once winter comes again, we get the real numbers.

Why would Florida have high levels of immunity? It was never hit hard until recently.

And I don't think this is about herd immunity, but simply about reducing the percent of the population that can infect and become infected, thus driving down the transmission rate.

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