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Christmastime, as countless carols and Hallmark movies remind us, is a season to relish in one’s family. But what if you’re thousands of miles…

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In a study published in May, researchers in the U.K. found that a two-dose regimen of the Pfizer vaccine was 88% effective against symptomatic Covid-19 from the delta variant. CDC officials anticipate similar results for Moderna’s vaccine.

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When you’re exposed to a virus or bacteria, your body tries to rid itself of the invader by creating proteins known as antibodies. These antibodies seek and attempt to destroy the trespassers, and the body keeps some antibodies on hand ready to fight if you’re exposed again.

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The researchers looked at rats and found they could regrow muscle after a period of loss until 24 months of age, but at 28 months this ability dropped off. Miller said this translates to humans in their 70s.