Viruses may seem all-powerful, given their practical invisibility and ability to take down human hosts, which are 10 million times larger than them. But all viruses have a weakness: they’re dependent ...

INDIANAPOLIS -- Ingrid Ozols Perdue runs several miles a week, lifts weights, cycles, does Pilates and even gets in an occasional kickboxing workout -- a regimen she credits with keeping her free of ...

Your immune system defends your body against infections and illnesses. It makes proteins called antibodies that counteract or kill germs, like viruses and bacteria. You get protection, or “immunity,” ...