Immune means protected from a disease because your body can fight it off, often thanks to previous exposure or vaccination. It can also mean not affected by something, like being immune to criticism.
From Latin "immunis" meaning "exempt, free from public service or burden," from "in-" (not) and "munia" (duties). The medical sense developed as scientists learned how bodies could be "exempt" from certain diseases.
Your immune system is like a living memory—it "remembers" past invaders and can attack them faster the next time. Being immune doesn’t always mean germs can’t enter; it means they get defeated so quickly you barely notice.
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