Rodent Allergy

Rodent allergy — to mice, rats, hamsters, guinea pigs and gerbils — is triggered by proteins in the animals’ urine, saliva and dander. In New York City it matters beyond pet ownership: mouse allergen is widespread in urban housing, and studies have found it in the majority of NYC apartments, where it is a significant driver of childhood asthma.

Common symptoms

• Sneezing and nasal congestion
• Itchy eyes, nose or skin
• Hives after handling a pet rodent
• Coughing or wheezing
• Worsening asthma, especially in children

Diagnosis & treatment

Testing identifies rodent allergen sensitivity. For pet owners, controls include cage placement away from bedrooms, frequent cleaning by a non-allergic family member and hand washing. For pest-related exposure, integrated pest management — sealing entry points, removing food sources and professional extermination — is the treatment that works. Medication and immunotherapy address remaining symptoms.