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Allergies to cats, a type of animal allergy, is one of the most common allergies experienced by humans. Among the eight known cat allergens, the most prominent allergen is secretoglobin Fel d 1, which is produced in the anal glands, salivary glands, and, mainly, in sebaceous glands of cats, and is ubiquitous in the United States, even in households without cats. Due to cats' grooming habits, the saliva is distributed to other areas of the animal, such as the hair and skin, increasing the impact of the allergen. The second most common is Fel d 2; this type is triggered by airborne dead skin flakes (dander) and their presence in the smell of cat urine.
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