Pfizer and Moderna Covid-19 Vaccines Shown to Prevent Infections in Study

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According to data from the United States Centers for Disease Control and Prevention study, two doses of the Pfizer and Moderna vaccines provide as much as a 90% protection against Covid-19 infection.

The CDC focused this study on about 4,000 people made up of health-care workers, first responders, teachers, and service workers from December 2020 to March of 2021.  The participants were tested for Covid weekly and regularly reported any symptoms.  Two weeks apart, the double shot vaccine prevented 90% of infections.  The study also included testing participants that developed symptoms as well as those who were picked up by the weekly tests.

The CDC said, ““The study demonstrates that these two mRNA vaccines can reduce the risk of all SARS-CoV-2 infections, not just symptomatic infection.”

It is important to note however that this study was relatively small in sample size, and had a small number of confirmed infections. The study did not have enough data to determine between the two manufacturers and was done before the Johnson & Johnson shot data was available.


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