Several more genomes (n=19) have been released and this picture still holds true with a plausible (note, *lots* of caveats) median date of ~ early/mid-December.https://twitter.com/K_G_Andersen/status/1219280708188827649 …
All things considered, I'm leaning towards human-to-human transmission being the main mode (possibly exclusively by now), but more data is definitely needed.
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I agree. For me this lack of diversity is one of the stronger pieces of evidence that it's primarily human-to-human. I have a hard time imagining a scenario having introductions over a longish time period that all come from incredibly closely related infections in animals.
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Agreed, although not entirely impossible - e.g., small animal population recently infected is brought into the food market and then infects people (probably not completely unlikely something like that could happen). But combined with the epi data, H2H seems more plausible.
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