An allergy is a hypersensitivity disorder of the immune system Allergic reactions occur when a person's immune system reacts to normally harmless substances in the environment.

A food allergy is an adverse immune response to a food protein. They are distinct from other adverse responses to food, such as food intolerance, pharmacological reactions, and ...

L'allergie est une réaction anormale et excessive du système immunitaire générée par un contact avec une substance généralement étrangère à l'organisme.