This suggests little diversity in founding viruses: - Either a single animal infected many people, - Multiple animals with similar viruses caused the initial infections, - Or there was only very few crossovers which then spread through person to person transmission.
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 …
The age of the virus population ~ corresponds to the time the outbreak was detected (mid-December). This means China detected the outbreak - caused by a novel virus - almost immediately. In the middle of flu season. Deeply impressive
. https://twitter.com/arambaut/status/1219239883719544837 …
. https://twitter.com/arambaut/status/1219239883719544837 …-
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To me the lack of diversity strongly implies that this is primarily person-person transmission.
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