Allergy is a state in which a person becomes sensitized to a particular antigen. The substances which cause allergies are called allergens.
Some of the common allergens which cause allergic reactions are:
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Type of allergen
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Examples
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Inhalants
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Pollen, smoke, dust, animal fur, perfumes, CO2, SO2 , etc.
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Contactants
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Paints, cosmetics, pollutants, metals.
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Food substances
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Egg, milk, prawns, wine, fish
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Infectious agents
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Bacteria, fungi, moulds, viruses
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Drugs
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Asprin, Penicillin, Tetracycline
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Physical agents
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Heat, cold, sunlight, radiations
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Other agents
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Dandruff, honey bee, wasp, pets, feathers
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Vaccines
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Typhoid
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