Relating to immunity against antigens or pathogens from a different species or source.
From 'hetero-' (different) and 'immune' (protected from disease). This immunological term emerged in the early 20th century as scientists studied cross-species immune responses.
Your body can develop heteroimmune responses to animal viruses—like how some people survive rabies exposure, their immune system recognizing the virus despite never encountering it before!
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