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The start of herd immunity makes some sense, but it doesn't fit that well with case counts or serology surveys which remain low.

My favourite fringe theory: herd immunity doesn't have to come solely from people having had the disease.
Maybe some significant fraction of humans just don't catch it very easily.

This is possible: if only 50% of the population is really ‘infectable’, then having 25% actually infected would get you into herd immunity territory.

Herd immunity fits perfectly well with low rates of seropositivity, if you can be infected, become immune, but have your serum antibodies go to zero, which happens with some infections and which seems (according to the Karolinska Institut report) to happen with this coronavirus.

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