Do Cockroaches and Mice at Home Cause Severe Colds in Kids?

A new study published in The Journal of Allergy and Clinical Immunology explored the connection between indoor allergens and upper respiratory infections (URIs) and related symptoms.

Researchers analyzed data from a previous childhood asthma study to measure allergen concentrations in both the air and dust of participants’ homes. The allergens tested included those from mice, cockroaches, dogs, and cats. Upper respiratory infections were diagnosed using nasal lining tests to detect viruses.

Key findings revealed that exposure to cockroach and mouse allergens significantly intensified cold symptoms in children with asthma. Doubling cockroach allergen concentration increased the likelihood of cold symptoms by 18%, cold and pneumonia symptoms by 31%, and cold symptoms accompanied by reduced lung function by 45%. Importantly, all participants in this group had an asthmatic background.

Mouse allergen concentrations were also positively associated with every outcome reviewed. These connections were notably stronger among children already sensitive to pest allergens.

Overall, the study suggests that exposure to cockroach and mouse allergens can worsen upper respiratory infections and related symptoms in children with asthma. Researchers concluded that maintaining household cleanliness and reducing exposure to these allergens is essential—particularly for asthmatic children—as proper hygiene may help prevent the worsening of cold symptoms and other respiratory illnesses.