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Pulsed-field gel electrophoresis (PFGE) typing was applied to the epidemiological investigation of 20 Serratia marcescens isolates collected from urine specimens of 17 patients and three urinals over a 2-month period. Twenty-five epidemiologically unrelated strains were also tested to determine the discriminatory power of PFGE. The PFGE fingerprints of each isolate were consistent in three different tests. The 20 outbreak isolates had an identical PFGE fingerprint pattern, while the epidemiologically unrelated strains demonstrated unique PFGE fingerprint patterns. The source of the outbreak was inadequately disinfected urinals. We conclude that PFGE served as a highly discriminatory and reproducible method for the epidemiological investigation of the outbreak of S. marcescens infection addressed by this study.

Use of pulsed-field gel electrophoresis to investigate an outbreak of Serratia marcescens