Abstract
Skin infection caused by Pseudomonas aeruginosa is the most frequent health problem associated with occupational saturation diving on the Norwegian continental shelf. In the course of 14-y surveillance of infection and environmental control in occupational offshore saturation diving systems, a collection of approximately 1000 P. aeruginosa isolates has been amassed. Retrospective genomic analyses using restriction enzyme fragmentation and pulsed-field gel electrophoresis have identified 24 of 76 environmental P. aeruginosa genotypes as being of significance for single infections, outbreaks of infections and recurrent skin infections in occupational diving systems. In addition, these genomic analyses have made it possible to separate outbreaks of infection into outbreaks with 1 single genotype and clusters of infections where different genotypes are involved. We conclude that the established, assumed diver-to-diver contagion vector ought to be replaced by a environmental contagion vector as the most likely vector within these specific occupational environments. Furthermore, consecutive presence of the frequent environmental/infectious genotypes demands specific improvement of infection prevention and control in these systems.
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