the.com/immune
Your body's velvet rope policy: pathogens checked against a list, troublemakers escorted out.
means Protected from a disease, or more broadly, exempt from something that affects everyone else.
from From Latin immunis, free from public service or tax — the original exemption was paperwork, not pathogens.
Tax rootsOriginally meant exempt from civic duties, not germs.
Memory cellsYour immune system remembers foes for decades.
Legal cousinDiplomatic immunity borrows the exact same Latin logic.