Mice and rats are the most commonly used laboratory animals. These animals have several very potent protein allergens that are excreted in their urine. However, almost all species of common laboratory animals can trigger allergic reactions from allergens found in their dander, hair, feathers, feces, saliva, lacrimal (tear duct) secretions, blood, serum and plasma. Personnel who regularly handle the animals are at the greatest risk of developing allergies. However, since allergens can become airborne on small particles or be carried on hair and clothing, people who do not directly work with animals may also be exposed.
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