“美國政府在周一公布的一項調查報告中指出，美國人早在2019年12月中旬冠毒被中國正式確認的數星期前，在美國政府衛健機構公布境內首件病例的一個月之前便遭到感染。”

根據聯邦疾控中心科學家的報告，冠毒很有可能於2019年12月中旬就在美國出現。

新的獻血樣本分析發現冠毒在美國西岸的出現早於之前以為的時段。

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