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. 1996 Mar;34(3):575–578. doi: 10.1128/jcm.34.3.575-578.1996

Genome macrorestriction analysis of sequential Pseudomonas aeruginosa isolates from bronchiectasis patients without cystic fibrosis.

S W Hla 1, K P Hui 1, W C Tan 1, B Ho 1
PMCID: PMC228849  PMID: 8904417

Abstract

The respiratory tracts of bronchiectasis patients may be persistently colonized with Pseudomonas aeruginosa, despite intensive chemotherapy. The organism may undergo phenotypic changes in these patients, providing misleading typing results by conventional methods. We prospectively studied eight bronchiectasis patients without cystic fibrosis over a period of 1 year. A high microbial load of P. aeruginosa was found in 70% of sputum samples collected. Of these, 55 sequential P. aeruginosa isolates were characterized by a genotyping method, pulsed-field gel electrophoresis, to overcome the problem of differentiating the P. aeruginosa strains during chemotherapy. Genome macrorestriction fingerprinting patterns were analyzed after digestion with XbaI restriction endonuclease. Of the eight patients, six harbored a single dominant strain of P. aeruginosa, with an intrapatient macrorestriction similarity pattern range of 96 to 100%. The other two patients were infected with mixed bacterial isolates including P. aeruginosa. However, diversity was observed in the P. aeruginosa isolates from all eight patients, with a relatedness of only 55 to 65%. The study further strengthens the fact that pulsed-field gel electrophoresis can be used efficiently and effectively to differentiate P. aeruginosa strains in bronchiectasis patients without cystic fibrosis.

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Selected References

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