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Recent research suggests that people who work out have stronger resistance to infectious diseases — including Covid — but experts say the findings need to be tested further.
People with H.I.V. and other immune-system problems may need the full two-dose regimen, researchers say. But the shots, particularly second doses, are hard to come by.
Researchers don’t fully understand the menstrual cycle’s effects on the immune system, but experts say there are reasons some may feel sick at certain points.
