Clinical Significance of Scedosporium apiospermum in Patients with Cystic Fibrosis

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Abstract
The incidence of airway colonization by Scedosporium apiospermum and of related sensitization was investigated prospectively in 128 patients with cystic fibrosis over a 5-year period, and results were compared with clinical data. Scedosporium apiospermum, recovered from sputum samples in 11 of 128 (8.6%) patients, was the most frequent filamentous fungus after Aspergillus fumigatus. Counterimmunoelectrophoresis, used to detect scedosporiosis serologically, was positive in 27 of 128 (21.1%) patients. The discrepancy between the mycological and serological results may be related to immune cross-reactions between Scedosporium apiospermum and Aspergillus fumigatus. However, symptoms of allergic bronchopulmonary disease were observed in two patients chronically colonized by Scedosporium apiospermum. The results clearly demonstrate that the frequency of this fungus is largely underestimated and that it may trigger an inflammatory response, thus suggesting a pathogenic role in patients with cystic fibrosis.

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