Background
Although mouse and cockroach allergy are known to be important in urban children with asthma, the independent association of mouse and cockroach sensitization with rhinitis in these children is unknown.
Objective
To determine the association of mouse and cockroach sensitization with rhinitis in urban children with asthma.
Methods
As part of the Mouse Allergen and Asthma Intervention Trial, 499 urban children (5–17yr) with persistent asthma underwent spirometry, skin prick testing to 14 common environmental allergens, serology for mouse-specific IgE. In 269 subjects, cockroach-specific IgE serology was also obtained. Patient/parent-reported rhinitis in the last two weeks and one year were the primary outcome measures. Mouse/cockroach exposure was measured by reported frequency of sightings. Mouse allergen settled bedroom dust samples were also measured in mouse-sensitized children.
Results
Rhinitis was reported in 49.9% and 70.2% of participants within the last 2 weeks and last one year, respectively. Serum mouse IgE level ≥0.35IU/mL was associated with rhinitis in the past two weeks (ORadj=2.15, 95%CI= 1.02–4.54, P=0.04) and the past year (ORadj=2.40, 95%CI =1.12–5.1, P=0.02) after controlling for age, race, gender, the presence of any smokers at home, primary caregiver education level, number of allergen sensitivities, cockroach IgE level ≥0.35IU/mL and study site (Boston or Baltimore). Measures of home mouse exposure were not associated with rhinitis, regardless of mouse sensitivity. Cockroach sensitivity was not associated with rhinitis regardless of sensitization to other allergens.
Conclusions
In urban asthmatic children, increased mouse-, but not cockroach-, IgE in the sera (mouse IgE ≥0.35IU/mL) may be associated independently with rhinitis.