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Journal of Clinical Microbiology, 03 1995, 572-575, Vol 33, No. 3
Copyright © 1995 by the American Society for Microbiology. All rights reserved.

Risk of cross-colonization and infection by Pseudomonas aeruginosa in a holiday camp for cystic fibrosis patients

JA Hoogkamp-Korstanje, JF Meis, J Kissing, J van der Laag and WJ Melchers
Department of Medical Microbiology, University Hospital Nijmegen, The Netherlands.

The risk of cross-colonization and subsequent infection by Pseudomonas aeruginosa in holiday camps for cystic fibrosis patients was studied in 91 children by culturing sputum at their arrival, at their departure, 2 months later, and at regular intervals thereafter. The isolated strains were subjected to serotyping, phage typing, pyocin typing, and genotyping by random amplified polymorphic DNA fingerprinting-PCR. It was concluded from random amplified polymorphic DNA fingerprinting-PCR typing that the Pseudomonas flora was not constant in most children. Some children harbored one genotype, whereas some harbored two or more different genotypes simultaneously. Most culture-positive children easily acquired a strain of another genotype which replaced the former one or coexisted with the original one. The incidence of sputum conversion was 7.7% in previously negative children; the incidence of permanent colonization and infection was 1.9%. This risk was comparable with that observed in the community. We conclude that the risk of cross- infection is trivial compared with the obvious joy and social benefit derived from a holiday camp.


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