Without A Vaccine, Researchers Say, Herd Immunity May Never Be Achieved
A growing number of researchers think until there's an effective vaccine, the coronavirus will simply persist in the population, causing illness indefinitely. Better to squelch the spread instead.
Đọc thêm tại NPR
at July 24, 2020 at 04:00PM
Health & Science
Thứ Sáu, 24 tháng 7, 2020
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