The team at the Seattle Flu Study have sequenced the genome the #COVID19 community case reported yesterday from Snohomish County, WA, and have posted the sequence publicly to http://gisaid.org. There are some enormous implications here. This case (see pic), WA2, is on a branch in the evolutionary tree that descends directly from WA1, the first reported case in the USA sampled Jan 19, also from Snohomish County, viewable here: https://nextstrain.org/ncov?f_division=Washington

This strongly suggests that there has been cryptic transmission in Washington State for the past 6 weeks.

MORE: https://twitter.com/trvrb/status/1233970271318503426