Prevention or treatment of anaphylaxis; the opposite of or resistance to anaphylactic reactions.
Direct combination of 'anti-' with 'anaphylaxis' (Greek 'ana-phylaxis', reversed protection). Appeared in medical literature in the early 20th century as anaphylaxis was being studied and understood.
Anaphylaxis kills people within minutes—naming its prevention as 'antianaphylaxis' represented hope and science's ability to fight back against the body's own immune system gone haywire, which is why this term appears in emergency medicine.
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