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Some people are at a higher risk for serious infection if they catch the coronavirus that causes COVID-19. They include people age 65 and older, women who are pregnant and people with certain illnesses. COVID-19 vaccines (and boosters or additional doses when appropriate) are especially recommended for people in these groups.

Why are these people more vulnerable to more serious COVID-19? Lisa Maragakis, M.D., M.P.H, Johns Hopkins senior director of infection prevention, explains.

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