As previously, the long branch leading to 21K is clearly visible, making it hard with current sequences to tell much about the evolutionary history. https://t.co/dQSPFv2lwmpic.twitter.com/hoxllKKTho
Looks like the new strain was either incubated in an immunocompromized person for months or serially passaged in a lab in the presence of convalescent plasma — along the lines of what the Italians did a while back. https://t.co/h8AyMcVJBH
