Previous COVID-19 infections may not protect you for long against new variants of the disease, a new CDC study says.
An unvaccinated teenager who tested positive for the COVID-19 Delta variant last year was re-infected with the Omicron variant in as little as 23 days, according to a case study that looked at potential limitations of "infection-induced" immunity from COVID-19.by the U.S.
Among the 10 people studied - five from Vermont, three from Wisconsin, one from Washington state and one from Rhode Island - the shortest time between infections was the teenager in Washington with 23 days. The longest was 87 days.Eight of the people studied were younger than 18, and only one had received a full series of COVID-19 vaccines. They weren’t eligible for a booster at the time of re-infection. No other patient was up-to-date on recommended COVID vaccines.
The CDC says vaccinations provide additional protection against COVID-19, even if you’ve been infected before. The agency warns that the findings "might not be generalized to the U.S. population," and the data is limited to the transition period when Omicron surpassed Delta as the dominant U.S. strain.
"Nonetheless, this study highlights potential limits of infection-induced immunity against novel variants," the study concludes. "Although the epidemiology of COVID-19 might change as new variants emerge, vaccination remains the safest strategy."
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