Anaphylactic shock

Anaphylaxis was discovered when animals injected with an immune serum to a specific foreign protein died upon re-exposure to the antigen. These reactions were named after the Greek for "overprotection", and weaker versions became known as allergies.
 Charles Robert Richet France 1902 Anaphylactic shock

Anaphylaxis was discovered when animals injected with an immune serum to a specific foreign protein died upon re-exposure to the antigen. These reactions were named after the Greek for "overprotection", and weaker versions became known as allergies.