Clinical importance of Alternaria exposure in children.

Sara Downs, Teresa Mitakakis, Guy Marks, Nicholas Car, Elena Beluosova, Jorg Leuppi, Wei Xuan, Sue Downie, Aurelio Tobias, Jennifer Peat

Research output: Contribution to journalArticle

160 Citations (Scopus)
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Abstract

The fungus Alternaria is known to be allergenic and is one of the most common fungi worldwide. We investigated the extent to which exposure to Alternaria increases the severity of asthma. We undertook a prospective cohort study in Australia of 399 school children who had positive skin tests to one or more aeroallergens. Airway responsiveness to histamine, wheeze, and bronchodilator use in 1 mo was measured five times between 1997 and 1999. Airway hyperresponsiveness was defined as PD20FEV1 = 3.9 µmol histamine. Airborne concentrations of Alternaria spores were measured throughout the study, and mean daily concentrations over 1 mo ranged from 2.2 to 307.7 spores/m3 of ambient air. Using generalized estimating equations, we found that airway responsiveness, wheeze, and bronchodilator use increased significantly in association with increased spore concentrations and that the increase in airway responsiveness was greater in children sensitized to Alternarxia than in other children (p = 0.01). The odds ratio for airway hyperresponsiveness in children sensitized to Alternaria was 1.26 (95% CI, 1.14 to 1.39) after an increase in mean exposure of 100 spore/m3/d over 1 mo. These results suggest that Alternaria allergens contribute to severe asthma in regions where exposure to the fungus is high.
Original languageEnglish
Pages (from-to)455-459
Number of pages5
JournalAmerican Journal of Respiratory and Critical Care Medicine
Volume164
Issue number3
Publication statusPublished - 2001

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