A U.K. study suggests an annual coronavirus booster shot may be necessary

Coronavirus vaccine development.
(Image credit: BEN STANSALL/AFP via Getty Images)

Early this year, reports of people in South Korea testing positive for the coronavirus again after apparently recovering set off alarm bells. The concern largely subsided, however, when the Korean Centers for Disease Control and Prevention determined the positive tests weren't reinfections.

Now, though, a new study from King's College in London suggests people may lose their COVID-19 immunity within months. The study analyzed the immune response of more than 90 patients and health-care workers, with blood tests revealing 60 percent developed a strong antibody response during their infections, but only 17 percent retained the same potency three months later. In some cases, antibody levels weren't detectable.

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