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Dogged by allergens.

In a study comparing how asthma sufferers are affected by several common allergens, including those from dogs, cats, cockroaches, and grass, researchers with the Asthma Clinical Research Network found that exposure to dog allergens caused the greatest disturbances in pulmonary function measurements in asthma patients. Effects included less air exhalation, more nitric acid released from respiratory tract cells, and more eosinophils in phlegm, said lead author Tim Craig of Penn State University. Nearly all participants (95%) were sensitive to at least one test allergen, with five the average number of positive tests per patient. Compared to outdoor allergens studied--such as those from trees, weeds, and grass--indoor allergens were associated with more markers of asthma instability. The study was presented at the May 2003 American Thoracic Society International Conference.
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Title Annotation:The Beat
Publication:Environmental Health Perspectives
Date:Aug 1, 2003
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