Most of them occur on mucous membrane. Allergens enter the body by the process of inhalation or ingestion.
Atopic individuals are those who are having abnormal high levels of circulating IgE and more than normal number of oesinophils.
The tendency to manifest localized anaphylactic reactions is called atopy.
Penicillin, sulfonamide, eggs, milk, dust mites, animal air, vaccines etc.
Allergens are non-parasitic antigens. They are capable of stimulating hypersensitive reactions in allergy conditions in an individual.
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