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booster shots

As immunity wanes fom the first booster, the FDA has now authorized a second shot for people 50 and older and some immunocompromised people. The CDC has also recommended that people get the booster. FREDERIC J. BROWN/AFP via Getty Images hide caption

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FREDERIC J. BROWN/AFP via Getty Images

CDC recommends 2nd COVID boosters for some older and immunocompromised people

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Costumers gather for food and drinks at Time Out Market in Lisbon, Portugal. Claire Harbage/NPR hide caption

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Claire Harbage/NPR

Portugal has one of the top vaccination rates but isn't taking chances with omicron

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Booster shots are now recommended for millions of Americans. Alejandra Villa Loarca/Newsday via Getty Images hide caption

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Alejandra Villa Loarca/Newsday via Getty Images

What you need to know about COVID boosters

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Illustration of antibodies (y-shaped) responding to an infection with the new coronavirus SARS-CoV-2. KATERYNA KON/SCIENCE PHOTO LIBRA/Getty Images/Science Photo Libra hide caption

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KATERYNA KON/SCIENCE PHOTO LIBRA/Getty Images/Science Photo Libra

How Long Does COVID Immunity Last Anyway?

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A third shot of the Moderna vaccine boosts protection across age groups, notably in older adults, the company says. Juana Miyer/Long Visual Press/Universal Imag hide caption

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Juana Miyer/Long Visual Press/Universal Imag

Federal health officials are planning ahead to give booster shots in the fall to all U.S. adults, starting with those who were vaccinated early on, like the elderly, health care workers and first responders. Mario Tama/Getty Images hide caption

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Mario Tama/Getty Images