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J Clin Microbiol. 1988 October; 26(10): 1973-1977

Genome fingerprinting of Pseudomonas aeruginosa indicates colonization of cystic fibrosis siblings with closely related strains.

Cystic Fibrosis Reseach Group, Zentrum Biochemie II, Hannover, Federal Republic of Germany.

ABSTRACT

The epidemiology of Pseudomonas aeruginosa infection at a cystic fibrosis (CF) center was monitored over a 3-year period. A total of 835 isolates from 72 unrelated patients and 22 siblings with CF were analyzed by genome fingerprinting and serotyping, bacteriophage typing, and pyocin typing. For genome fingerprinting, bacterial chromosomes were digested with one of the restriction endonucleases SpeI, DraI, XbaI, SspI, and NheI, which cut only rarely, and subsequently separated by field inversion gel electrophoresis. The physical genome analysis allowed us to classify P. aeruginosa strains in terms of DNA relatedness. Related strains differed by fewer than six DraI bands in the fingerprint, whereas unrelated strains differed by more than 20 DraI bands. All unrelated CF patients were colonized with different strains. The absence of a nosocomial spread of organisms at the CF center was attributed to the strict hygiene measures observed at the hospital. CF siblings were harboring either identical or closely related strains; transmission within the family is thought to be the most likely cause.

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