“美国政府在周一公布的一项调查报告中指出，美国人早在2019年12月中旬冠毒被中国正式确认的数星期前，在美国政府卫健机构公布境内首件病例的一个月之前便遭到感染。”

根据联邦疾控中心科学家的报告，冠毒很有可能于2019年12月中旬就在美国出现。

新的献血样本分析发现冠毒在美国西岸的出现早于之前以为的时段。

Covid-19 Likely in U.S. in Mid-December 2019, CDC Scientists Report

New analysis of blood donations finds virus was present on West Coast earlier than previously believed

By Betsy McKay

Nov. 30, 2020 7:27 pm ET

“The new coronavirus infected people in the U.S. in mid-December 2019, a few weeks before it was officially identified in China and about a month earlier than public health authorities found the first U.S. case, according to a government study published Monday.”

https://www.wsj.com/articles/covid-19-likely-in-u-s-in-mid-december-2019-cdc-scientists-report-11606782449?redirect=amp#click=https://t.co/vMYI60oPNP