Strain differences are *extremely* unlikely. No strain right now is more than about 40 nucleotides different from any other, all kinds of deep branches have gone all over the world, most countries have multiple branches from all over the tree, and there just hasn’t been enough time in an explovely expanding outbreak for much in the way of evolution to have occurred at all. Most of the observed mutations are silent anyway.
The first serological data on a set of close contacts of hospitalized cases found 16 PCR-positive cases and an additional 7 that developed antibodies but were not successfully caught with PCR tests. Some of which did develop symptoms.
Strain differences are *extremely* unlikely. No strain right now is more than about 40 nucleotides different from any other, all kinds of deep branches have gone all over the world, most countries have multiple branches from all over the tree, and there just hasn’t been enough time in an explovely expanding outbreak for much in the way of evolution to have occurred at all. Most of the observed mutations are silent anyway.
The first serological data on a set of close contacts of hospitalized cases found 16 PCR-positive cases and an additional 7 that developed antibodies but were not successfully caught with PCR tests. Some of which did develop symptoms.