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Posted on: September 22, 2022 at 12:54:00 CT
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Vaccination following prior infection from Covid-19 has long been recommended because both natural and vaccine-induced immunity eventually wane. In addition, much still isn't known about natural immunity, particularly from an infection from a long time ago, said Ali Ellebedy, an immunologist at Washington University in St. Louis.
"There are so many variables you cannot control that you just cannot use it as a way to say, 'Oh, I'm infected then I am protected,'" Ellebedy said.
In its report, CDC noted that most people had not yet received booster shots during the analyzed time period. The agency also said the results of the study could not be applied to the omicron variant, but added it would release more studies focused on omicron in the coming days.