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Allergy TestingThe term allergy is derived from two Greek words which mean "altered reactivity". That is, an allergy is an adverse reaction to a normally harmless substance which may be a food or other environmental agent such as dusts, pollens or chemicals. The difference between Allergy and Sensitivity The term ALLERGY is used to describe those cases in which the adverse reaction to a substance occurs almost immediately, usually within an hour and the reaction is obvious and often quite violent, for example, developing a rash or hives after eating berries or being violently sick after eating shellfish. True allergies are quite rare, affecting only a small percentage of the population and most often develop during childhood. SENSITIVITIES or INTOLERANCES on the other hand, affect a great number of people and can be developed at any time of life. EXAMPLE - The symptoms of food sensitivity rarely occur immediately the food is eaten. In fact the reactions are usually delayed by many hours, or even many days. For example, the bread eaten on Monday could be the cause of Thursday's joint pain. It is these delayed reactions which make the detection of the culprit a most difficult task without the help of expert laboratory testing.
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