The similar genomes of 2 #coronavirus infections in #Washington suggest #COVID19 may have been spreading in the state for ~6 weeks. 150—1,500 people “have either been infected and recovered or currently are infected now.” Expect many more cases, soon.

Unfortunately, community spread of #coronavirus has been occurring in MULTIPLE regions for weeks. In #Oregon, the infected school worker(!) had symptoms for a week before being tested — add the long incubation period, and this person likely was infected 2-3 weeks ago.#COVID19

— Dr. Dena Grayson (@DrDenaGrayson) March 1, 2020