the.com/immune response

means The coordinated system your body uses to detect, attack, and remember harmful invaders like viruses and bacteria.

from 'Immune' traces to Latin immunis — 'exempt from duty' (in-, 'not,' plus munis, related to munus, 'service' or 'obligation,' the same root that gives us 'municipal' and 'community'). Originally it meant being excused from paying taxes or performing public service; by the late 1800s, as scientists discovered how bodies resist disease, the word was borrowed to describe being exempt from illness itself. 'Response' comes from Latin respondere, 'to answer back' — so at its root, an immune response is literally your body answering an invader after declaring itself off the hook from surrender.