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After COVID-19 vaccine doses, how long does protection last?

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In the United States, the number of adults who have received at least one dose of a COVID-19 vaccine is now higher than the number who haven’t. In addition, one in three U.S. adults are now fully vaccinated, according to data from the Centers for Disease Control and Prevention.

With so many Americans becoming immunized — and millions more joining them each day — it’s natural to look ahead and wonder how long this protection will last.

The answer is as simple as it is unsatisfying: No one knows.

“We don’t know yet how long immunity lasts from the vaccines that we have at hand right now,” Dr. Katherine O’Brien, who heads the vaccines department at the World Health Organization, said in a podcast. “We’re really going to…



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