4 ms·

Has anyone tried to play the "movie" in the map. As I understand it, there has already been back-propagation of the virus from North America back to Asia. Can a

• mmmrtl 7y ago
  That backprop is most likely an artifact of a sample on a lineage being sequenced in North America, but the lineage also continues in Asia, where that lineage had not been sequenced yet. As in, someone in Asia spread COVID-19 to two people, one of whom traveled to North American and had their virus sequenced. The lineage also continued in Asia and was eventually sequenced days/weeks later, so the inferred tree includes a North American sample seeming to give rise to more Asian infections.
  • borkt 7y ago
    My father in law is a pilot (currently not showing any systems virus) has been back and forth between China, Korea, HK (Guangzou most recently) at least 3 times since January. His last trip he was one of only 30 people in the hotel, being monitored every 30 minutes or so for fever while on a layover. His company is still scheduling him trips there, so I have no doubt with companies still requiring similar travel that it could have easily gotten back to China from someone who has been in the US over the past few months, now that we know it has been in the wild here for at LEAST 6 weeks.
    • wahern 7y ago
      mmmrtl's explanation seems more parsimonious.
      • RL_Quine 7y ago
        That’s a really good word.