An allergy is the hypersensitivity of immune system of a person to some foreign substance called allergy which either comes in contact with or enters the body .
The allergies include dust , moulds , pollen , certain foods and madicines such as penicillin .
Allergy involves mainly IgE antibodies and histamine .
The common manifestation of allergy is asthma and sometimes an allergy may caused a sudden , violent fatal reaction in a sensitive individual , it is called anaphylaxis.
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