Histamine
A physiological compound released by cells of the immune system in the course of an allergic reaction when the allergen interacts with a specific antibody bound to said cells.
To topHymenoptera
A family of insects which are characterised by having two pairs of well developed wings (includes the bees, wasps and hornets).
To topHypersensitivity
An over-exuberant response on the part of the immune system which can lead to allergic manifestations. Distinction is made between immediate hypersensitivity (in which the reaction occurs as soon as the trigger is encountered) and delayed hypersensitivity (in which the reaction only becomes manifest after a certain [variable] lapse of time).
To topHyposensitisation
See "desensitisation".
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