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COVID-19 vaccines may offer better protection against reinfection than natural immunity, according to a new study from the Centers for Disease Control and Prevention.
“If you’ve had COVID-19 before, please still get the vaccine,” CDC director Dr. Rochelle Walensky said in a statement. “This study shows that you are twice as likely to be infected again if you are not vaccinated. Getting the vaccine is the best way to protect yourself and others, especially as the most contagious Delta variant is spreading across the country. “
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The study compared 246 Kentucky patients who had been re-infected with the coronavirus with 492 patients who had not been re-infected. He found a lower vaccination rate among those who had been re-infected.
“Residents of Kentucky with previous infections who weren’t vaccinated had a 2.34 times greater chance of re-infection compared to those who were fully vaccinated,” the study authors wrote.
However, the study has certain limitations. First, re-infections were confirmed using antigen testing and not the full genome sequencing needed to confirm that re-infection was caused by a separate virus and was unrelated to the first infection. Second, people who have been vaccinated are less likely to be tested for COVID-19, which could overestimate the relationship between no vaccination and reinfection.
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Finally, the study has a relatively small sample size of just 738 patients. Smaller sample sizes are more prone to biased results. The study authors noted that additional studies with “larger populations are warranted to support these findings.”
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Keywords: Health, Coronavirus, Delta Variant, Vaccination, Centers for Disease Control and Prevention, CDC, Rochelle Walensky, Kentucky
Original author: David Hogberg
Original location: Vaccination May Offer More Protection Than Natural Immunity Against COVID-19, CDC Study Says
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