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送交者: 2pz 于 2020-05-21 14:42:01

回答: 卧槽,文章又被删掉了。 由 胡涂仙 于 2020-05-21 14:16:11

Coronavirus circulating among blood donors before first confirmed case in Italy

Women wearing face masks and rubber gloves walk past a train on a platform.

Studies are still underway to determine what antibody level would be needed for immunity.(AP: Luca Bruno)
A study by Milan's Polyclinic hospital indicates the coronavirus was circulating in the Italian city before the first domestically transmitted case was confirmed in a town less than an hour away.

The study of a random sample of blood donors with no symptoms showed that 4.6 per cent already had antibodies against the virus at the start of the epidemic.

That percentage rose to 7 per cent by the beginning of April, when Italy was under lockdown.

The researchers analysed samples from 800 blood donations between February 8 and April 24

The first domestically transmitted disease was recorded on February 21.

Researchers said all donors who tested positive showed changes in their blood, which could provide clues to identifying asymptomatic carriers.

The study, involving researchers at the Polyclinic, Milan University, Sacco Hospital and the European Oncological Institute, was released in a preliminary form before being submitted to scientific journals for peer review.

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