JAC Advance Access published online on January 25, 2006
Journal of Antimicrobial Chemotherapy, doi:10.1093/jac/dkl002
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1 Antimicrobial Research Laboratory, Department of Bacterial and Inflammatory Diseases, National Public Health Institute, Kiinamyllynkatu 13, 20521 Turku, Finland; Department of Medicine, Turku University Hospital, Kiinamyllynkatu 4-8, 20520 Turku, Finland
* To whom correspondence should be addressed. Objectives: The proportion of Salmonella isolates with reduced susceptibility to fluoroquinolones has increased during recent years in many countries, especially in South-east Asia. The present study was performed to evaluate the incidence of and changes in quinolone resistance in Salmonella isolates of either foreign or domestic origin in Finland. Methods: A total of 1004 Salmonella isolates collected from Finnish patients between 2000 and 2004 were analysed for ciprofloxacin susceptibility. Of these isolates, 504 were of domestic origin and 500 were of foreign origin, collected from travellers to 43 different countries. The Salmonella collection consisted of 89 different serotypes. All isolates belonged to non-typhoidal Salmonella enterica. Results: Of all isolates, 3 (0.3%) were ciprofloxacin-resistant (MIC Conclusions: Our results show that reduced fluoroquinolone susceptibility in S. enterica is not restricted to South-east Asia alone but continues to grow rapidly in many parts of the world including countries of the European Union.
Received October 19, 2005
Revised December 11, 2005
Accepted December 23, 2005
Brief report
Reduction in fluoroquinolone susceptibility among non-typhoidal strains of Salmonella enterica isolated from Finnish patients
Antti J. Hakanen 1 *,
Pirkko Kotilainen 1,
Susa Pitkänen 1,
Solja Huikko 2,
Anja Siitonen 3,
and
Pentti Huovinen 2
2 Antimicrobial Research Laboratory, Department of Bacterial and Inflammatory Diseases, National Public Health Institute, Kiinamyllynkatu 13, 20521 Turku, Finland
3 Enteric Bacteria Laboratory, Department of Bacterial and Inflammatory Diseases, National Public Health Institute, Mannerheimintie 166, 00300 Helsinki, Finland
Antti J. Hakanen, E-mail: antti.hakanen{at}utu.fi
Abstract 
4 mg/L) and 214 (21.3%) exhibited reduced susceptibility to ciprofloxacin (MIC 0.125-2 mg/L). The annual proportion of reduced susceptibility varied between 3 and 15% among the domestic Salmonella isolates (P = 0.123). Between 2000 and 2004, the annual proportion of reduced susceptibility increased significantly (from 23 to 39%; P = 0.001) among all foreign isolates as well as among those from Spain alone (from 4 to 73%; P < 0.001). Among the isolates from Thailand, reduced ciprofloxacin susceptibility remained at a constantly high level (52-66%) throughout the study.
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