Abstract
The occurrence of various Pseudomonas aeruginosa strains in the sputum of 15 patients with cystic fibrosis (CF) was monitored over periods ranging from 2 to 60 months. Isolates of P. aeruginosa were typed by four different techniques, namely serotyping, active and passive pyocin typing, and phage typing. The maximum number of different serotypes found in the patients was three (one serotype in nine patients; two serotypes in five patients; three serotypes in one patient). Pyocin and phage typing showed no marked differences between strains of the same serotype in individual patients. Exacerbations of chronic respiratory infection were not associated with changes in the sputum flora, the composition of P. aeruginosa strains in which remains constant over long periods in patients with CF.
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