@jbbl_maths @DailyJLee One person was known to be symptomatic in Washington, and assumed to be the index patient, although I'm not sure that was ever determined (I think no sequencing at the time).
@jbbl_math@DailyJLee华盛顿有一个人已知有症状，并被假定为指数患者，但我不确定这是否已经确定（我认为当时没有测序）。