Tandem repeat analysis for surveillance of human Salmonella Typhimurium infections |
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Authors: | Torpdahl Mia Sørensen Gitte Lindstedt Bjørn-Arne Nielsen Eva Møller |
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Institution: | Department of Bacteriology, Mycology and Parasitology, Statens Serum Institut, Copenhagen, Denmark. mtd@ssi.dk |
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Abstract: | In Denmark, as part of the national laboratory-based surveillance system of human enteric infections, all Salmonella enterica serotype Typhimurium isolates are currently subtyped by using phage typing, antimicrobial resistance profiles, and pulsed-field gel electrophoresis (PFGE). We evaluated the value of real-time typing that uses multiple-locus variable-number tandem-repeats analysis (MLVA) of S. Typhimurium to detect possible outbreaks. Because only a few subtypes identified by PFGE and phage typing account for most infections, we included MLVA typing in the routine surveillance in a 2-year period beginning December 2003. The 1,019 typed isolates were separated into 148 PFGE types and 373 MLVA types. Several possible outbreaks were detected and confirmed. MLVA was particularly valuable for discriminating within the most common phage types. MLVA was superior to PFGE for both surveillance and outbreak investigations of S. Typhimurium. |
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Keywords: | Salmonella Typhimurium surveillance outbreak phagetyping PFGE VNTR MLVA research |
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