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COVID-19: How much protection is in the 1st dose of vaccine?

Two infectious diseases doctors answer viewer questions about COVID-19 vaccines, including how much protection people get from the first dose and how variants may change that.

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Видео COVID-19: How much protection is in the 1st dose of vaccine? канала CBC News: The National
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11 мая 2021 г. 8:08:00
00:08:03
Яндекс.Метрика