What does the term anaphylaxis describe?

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A serious allergic response occurring after injecting a protein solution into a previously sensitized personA severe reaction triggered by the initial injection of protein solutionsImmunity developed through repeated administration of foreign substancesA strong allergic reaction caused by sensitivity to common allergens

Explanation

Anaphylaxis is a severe allergic reaction that happens when a sensitized individual receives an injection of a protein solution. It is not caused by the first exposure or general immunity, but by a heightened immune response in someone previously sensitized.