New data in a real-world setting shows that two of the vaccines for COVID-19 authorized in the United States not only prevent severe illness and hospitalization from the coronavirus but also infection.
The results of a new study from the Centers for Disease Control and Prevention show that the Pfizer-BioNTech and Moderna vaccines are 90% effective at preventing both symptomatic and asymptomatic COVID-19 infections for those who are fully vaccinated. They are 80% effective for those who have received one dose.
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In the study, healthcare personnel, first responders, and other essential and front-line workers who were vaccinated were compared with those who remained unvaccinated. From Dec. 14 to March 13, the CDC tested 3,950 workers weekly for COVID-19.
There were only three infections among the 2,479 workers who had received both doses of the vaccine. Among the 477 who had received only the first doses, there were eight infections. There were 161 infections among the 944 workers who were not vaccinated.
Previous research involving healthcare workers in England and Israel yielded similar results.
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The results could mean that the Pfizer and Moderna vaccines may stop transmission of the virus, preventing it from spreading from one person to another.
