What Is the Covid-19 Vaccine Booster? Topic Guide

What Is the Covid-19 Vaccine Booster? What Is the Covid-19 Vaccine Booster?: Of the three COVID-19 vaccines authorized for use in the U.S. that have been shown to be highly effective in reducing the risk of severe disease (including the Delta variant), hospitalization, and death, two of them require boosters. The Modern and Pfizer COVID-19 vaccines involve two shots, while the Johnson & Johnson vaccine involves just one shot.

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