Pfizer to Vaccinate Entire City of Toledo in Brazil As Part of Study अक्तूबर 10, 2021 byप्रगतिवादी मंच एक टिप्पणी भेजें The study will follow participants for up to one year to find out how long vaccine protection lasts against Covid-19 and new variants. source https://www.nytimes.com/2021/10/10/world/pfizer-vaccinate-entire-city-toledo-brazil.html
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