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The U.S. Centers for Disease Control and Prevention says you’re fully vaccinated two weeks after receiving a second dose of the Pfizer or Moderna vaccine, or one dose of the J&J.
The vaccines offer strong protection against serious illness. But U.S. health officials now recommend boosters for some people at higher risk for severe illness from COVID-19 based on evidence that protection against milder disease can wane, especially among older adults.
The CDC says people 65 and older, long-term care residents and others ages 50 to 64 with health problems such as diabetes or heart disease should get boosters if they got Pfizer shots at least six months ago.
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People who got the Moderna and J&J vaccines aren’t eligible for boosters yet, but that’s likely coming soon.
The availability of boosters varies around the world. Britain and Israel have also been giving boosters, despite objections from the World Health Organization that poor countries still don’t have enough for their initial doses.