Abstract
Isolation of mucoid strains of P. aeruginosa from bronchial secretions has occurred usually in the setting of cystic fibrosis. This association was so strong that it is considered a sign of the presence of cystic fibrosis. The records of 31 patients in whom this strain was isolated were reviewed; in contrast to previous experiences, only 2 of the patients could be considered to have cystic fibrosis. The remainder all had a chronic pulmonary disease, and common to all was the presence of bronchiectasis. Evidently, isolation of mucoid strains of P. aeruginosa from bronchial secretions of adults with a chronic pulmonary process indicates the presence of underlying bronchiectasis.

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