COVID-19 mRNA Vaccines Reduce Infection Risk by 91%

A new analysis, conducted by the Centers for Disease Control and Prevention (CDC) from the U. S., shows that COVID-19 mRNA vaccines decrease infection risk by 91% after two doses and 81% after one dose.COVID-19 mRNA Vaccines Reduce Infection Risk by 91%

The scientists analyzed data from 3,975 participants in 8 regions of the United States. Every person had to undergo testing for SARS-CoV-2 infection once per week for 17 weeks, from December 13, 2020, to April 10, 2021.

In their analysis, the researchers considered other factors that could influence the results, including how often participants used personal protective equipment at work and in the community and the circulation of SARS-CoV-2 in their area.

The scientists conclude in their paper: “Once fully vaccinated, participants’ risk of infection was reduced by 91%. After partial vaccination, participants’ risk of infection was reduced by 81%. These estimates included symptomatic and asymptomatic infections.”

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