Reduced Fluoroquinolone Susceptibility in Salmonella enterica Isolates from Travelers, Finland
Marianne M. Lindgren , Pirkko Kotilainen, Pentti Huovinen, Saija Hurme, Susanna Lukinmaa, Mark A. Webber, Laura J.V. Piddock, Anja Siitonen, and Antti J. Hakanen
Author affiliations: National Institute of Health and Welfare, Turku, Finland (M.M. Lindgren, P. Kotilainen, P. Huovinen, A.J. Hakanen); Turku University Hospital, Turku (P. Kotilainen, A.J. Hakanen); University of Turku, Turku (S. Hurme); National Institute of Health and Welfare, Helsinki, Finland (S. Lukinmaa, A. Siitonen); University of Birmingham, Birmingham, UK (M.A. Webber, L.J.V. Piddock)
Figure 2. Dendrogram showing the clonal relationships among 36 isolates of Salmonellaenterica collected from travelers returning to Finland from Thailand or Malaysia, 2003–2007. These isolates showed the nonclassical quinolone resistance phenotype (i.e., reduced susceptibility to ciprofloxacin [MIC >0.125 µg/mL] and susceptibility or low-level resistance to nalidixic acid [MIC <32 µg/mL]). No., number of Salmonella isolates belonging to a certain pulsed-field gel electrophoresis (PFGE) pattern.
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