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CDC: Vaccination May Cut Risk of COVID Reinfection in Half

Updated: Aug 16, 2021

The US Centers for Disease Control and Prevention has recommended that everyone get a COVID-19 vaccine, even if they've had the virus before. Yet many skeptics have held off getting the shots, believing that immunity generated by their previous infection will protect them if they should encounter the virus again.

A new study published today in the CDC's Morbidity and Mortality Weekly Report pokes holes in this notion. It shows people who have recovered from COVID-19 but haven't been vaccinated have more than double the risk of testing positive for the virus again, compared with someone who was vaccinated after an initial infection.

The study looked at 738 Kentucky residents who had an initial bout of COVID-19 in 2020. About 250 of them tested positive for COVID-19 a second time between May and July of 2021, when the Delta variant became dominant in the US.


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