The case-control study showed that being unvaccinated was associated with 2.34 times the odds of reinfection compared with being fully vaccinated.
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Alyson Cavanaugh, the lead author of the study, reported that while most illnesses in 2020 were caused by the original coronavirus strain, the alpha strain was predominant in Kentucky throughout May and June.
This, she said, suggests that the natural immunity gained from being infected is not as strong as the immunity gained from a vaccine, especially while the virus continues to evolve.
“Getting the vaccine is the best way to protect yourself and others around you, especially as the more contagious Delta variant spreads around the country,” she said.