Why Coronavirus Vaccine Trials Need Large Numbers Of Volunteers
Over 100,000 people worldwide are taking part in coronavirus vaccine trials. NPR answers common questions, such as why so many people are needed and what it means to say a vaccine works.
Đọc thêm tại NPR
at September 23, 2020 at 03:24AM
Health & Science
Thứ Tư, 23 tháng 9, 2020
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