美去年12月或已有新冠

COVID-19 likely in US in Dec 2019
美去年12月或已有新冠

COVID-19 infections were present in the US as early as mid-December 2019, weeks before it was first identified in China and about a month earlier than the first case was officially confirmed in the US, according to a new study by the US Centers for Disease Control and Prevention (CDC).
根據美國疾病控制和預防中心的一項新研究，新冠病毒感染病例早在2019年12月中旬就已在美國出現，比中國首次發現新冠病毒的時間早了幾周，比美國正式確認首例病例早了約一個月。

In the study published in the journal Clinical Infectious Diseases, CDC researchers tested blood samples from 7,389 routine blood donations collected by the American Red Cross from Dec 13, 2019, to Jan 17, 2020, for antibodies specific to the novel coronavirus, known as SARS-CoV-2.
該研究發表於《臨牀傳染病》雜誌上，研究顯示，疾控中心研究人員對美國紅十字會從2019年12月13日至2020年1月17日收集的7389名常規獻血者的血液樣本進行了檢測，以檢測新型冠狀病毒(即SARS-CoV-2)的特異性抗體。

The researchers found evidence of infection in 106 of the 7,389 blood donations from residents in nine states.
研究人員發現7389份血液樣本中的106份含有新冠病毒抗體，這些血液樣本來自美國9個州。

The findings suggest that SARS-CoV-2 infections may have been present in the US in mid-December 2019, earlier than the first identified case in the US on Jan 19 this year.
研究結果表明美國新冠感染病例可能在2019年12月中旬就已經出現，早於美國2020年1月19日報告的首例確診病例的時間。