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Four Years on, the Mysteries of Covid Are Unraveling

Are superdodgers real? Is Covid seasonal? And what’s behind its strangest symptoms? Here’s what we’ve learned.

After 217 Covid Vaccines, Man Had No Side Effects and Robust Immunity

Media accounts of a German man’s extreme vaccination history spurred researchers to analyze his immune responses.

Older Americans Should Get Another Covid Shot This Spring, C.D.C. Says

The agency recommended another round of vaccinations for Americans ages 65 and older.