The amount of mouse allergens found in the air in many inner-city homes could be high enough to trigger asthma symptoms in the children who live there, say researchers at the Johns Hopkins Children’s Center. Their study, published in the February issue of the Journal of Allergy and Clinical Immunology, found more than a quarter of inner-city homes sampled had airborne allergen levels already known to aggravate asthma symptoms in animal research lab workers with mouse allergy. 
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