Immunity from COVID-19 vaccines starts to wane after about five months,But Dr. Akiko Iwasaki, immunologist at Yale University,that people who had been fully vaccinated and have previously caught the virus were "likely to be the last group that really needs the booster" because their immune system had had "three exposures" - two vaccine doses and one infection, all of which trigger an immune response.
Dr. Paul Offit, director of the Vaccine Education Center at Children's Hospital of Philadelphia, said that people who were infected and vaccinated "just won the game," per"I wouldn't ask them to get a booster dose. I think they just got it," he said, referring to the immune system boost from an infection.
Vaccines produce an immune response to one part of the virus, called the spike protein, so you get "spike-specific" immunity, McLean said. Getting COVID-19 triggers an immune response to more than one part of the virus, which means your immune system should later be better prepared to fight variants that have mutations, he said.But McLean also warned it would be "dangerous" for anybody to deliberately try to catch COVID-19 because of the risk of severe disease.
Paul Bieniasz, virologist at the Rockefeller University, said that catching COVID-19 after vaccination may not have the same effect. "It's more variable," Bieniasz told Insider.We can't yet reliably detect whether people have had an antibody response to COVID-19 either before or after vaccination. Protection also wanes over time, so the timing of an infection or vaccination matters too - people who had COVID-19 prior to vaccination may eventually need a booster.
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