??????????...... | ???

???

2020-12-03 19:00:54???: ????
???????????????12?????????????????
?????????????12?????????????????

??

??????12?1????????????????????????????????????2019?12?????????????????????????????????????


??


The new coronavirus infected people in the US in mid-December 2019... about a month earlier than public health authorities found the first US case, according to a government study published Monday.
??
???????????�?????????????????�?

??


??
??????????????????????????????????????? ?CDC??????????????????9???7389??????????106?????????????


??


Scientists at the US Centers for Disease Control and Prevention found evidence of infection in 106 of 7,389 blood donations collected by the American Red Cross from residents in nine states across the US, according to the study published online in the journal Clinical Infectious Diseases.
??
???????????????????2019?12?13??2020?1?17???????


??


The scientists based their study on blood samples that the American Red Cross collected between Dec. 13 and Jan. 17 ...
??????????????????????12?13??12?16??????39????????????????????????????????12?30??1?17?????????????????????????????????????????????67????????


???????????????????????


??


??????????????????????????????????????????????
??????????????????????????????????????????????90????????????????????????84???????????????SARS-CoV-2???????


??


They did that by looking for antibodies specific to the new coronavirus in 90 of the samples. They said they found antibodies specific to SARS-CoV-2 in 84 of the samples, or nearly all of them.
????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????


??????????????????????????????????????????


??????5?????????????????????????????1??????????????????????????????????????????????


??????3?11?????????????????????????�????? ?Robert Redfield??????????�??�????????????????????????????????????????


?

?

?????????????????????????????????????????????????????????????


??


The United States on Wednesday recorded its single-worst daily death toll since the pandemic began, and on a day when Covid-19 hospitalizations also hit an all-time high, the pace of loss showed no signs of slowing any time soon.

???????