perennial allergy definition
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Perennial allergies are often a reaction to house dust. House dust may contain mold and fungal spores, fibers of fabric, animal dander, dust mite droppings, and bits of insects. Substances in and on cockroaches are often the cause of allergic symptoms.
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Perennial allergy appears at any time year-round. Indoor allergies to dust, mould, cockroaches, feathers and pet dander, food allergies and allergies due to insect bite are perennial allergies.
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