The Los Angeles Times quoted Santa Clara County health officer Sara Cody in a piece saying， "we presume that each of them represents community transmission and that there was some significant level of virus circulating in our community in early February."
County Executive Officer Jeffrey V. Smith said this is evidence that the coronavirus was circulating in California as early as January or even earlier.
California Gov. Gavin Newsom has ordered all counties in the state to review autopsies of suspected coronavirus deaths dating back to December.
When did the novel coronavirus first appear in the US？ Did community transmission of the coronavirus start sooner than it was reported？
7.全球首个启动新冠疫苗人体试验，这么快是怎么拿到毒株的？
7.How did the US get the virus strains so soon to start the first human testing of a vaccine against COVID-19？
据《华尔街日报》报道，美国国立卫生研究院(National Institutes of Health)3月16日称，生物科技公司Moderna Inc. (MRNA)针对新型冠状病毒的试验性疫苗已开始首次人体测试。
对于全球首次针对新型冠状病毒的疫苗人体试验在美国启动一事，专家表示，美国这一针实在太快了，除非很早就开始进行试验，更早的拿到了病毒株。
美国疫苗人体试验为何进行得如此之快？美国是什么时候通过什么方式获得的毒株？
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