That calculus has changed, says Dr. Colleen Kelley, an associate professor of medicine in the division of infectious diseases at Emory University School of Medicine. The virus that causes Covid continues to spread, due largely to millions of people who remain unvaccinated, and vaccine protection is waning more significantly over time than experts expected two months ago.
That means the odds of breakthrough infections in fully vaccinated people — with potentially serious symptoms — are increasing. Booster shots, Kelley says, can increase antibody levels enough to help prevent those infections and return any breakthrough symptoms to a mild or nonexistent state.
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That means the odds of breakthrough infections in fully vaccinated people — with potentially serious symptoms — are increasing. Booster shots, Kelley says, can increase antibody levels enough to help prevent those infections and return any breakthrough symptoms to a mild or nonexistent state.

New data says you should get a Covid vaccine booster shot as soon as you're eligible â here's why
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