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The condition is fortunately rare. Often undue sensitivity to injected substances can be demonstrated by the use of small test doses, but even a small test dose may trigger off anaphylactic shock in a "sensitised" individual. Those who feel faint or start to swell in the face after an insect bite or sting should at once seek a doctors help, although neither of these reactions necessarily heralds anaphylactic shock.

ANTIBODY-ANTIGEN:
When certain foreign bodies and therefore potentially harmful substances enter the body, the body reacts to the threat by producing antibodies. An antibody is a chemical compound (protein) which has the ability to combine with and render harmless a specific foreign substance. The foreign material itself, which initiates the reaction leading to the formation of specific antibodies is known as an antigen.

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