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Journal of Clinical Microbiology, June 2003, p. 2395-2400, Vol. 41, No. 6
0095-1137/03/$08.00+0     DOI: 10.1128/JCM.41.6.2395-2400.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Several Salmonella enterica subsp. enterica Serotype 4,5,12:i:- Phage Types Isolated from Swine Samples Originate from Serotype Typhimurium DT U302

E. de la Torre,1* D. Zapata,1 M. Tello,1,2 W. Mejía,1 N. Frías,3 F. J. García Peña,3 E. M. Mateu,1,2 and E. Torre1

Departament de Sanitat i Anatomia Animals,1 Centre de Recerca en Sanitat Animal, Facultat de Veterinària, Universitat Autònoma de Barcelona, 08193 Bellaterra,2 Laboratorio de Sanidad Animal, Ministerio de Agricultura, Pesca y Alimentación, Algete 28110, Spain3

Received 8 October 2002/ Returned for modification 16 December 2002/ Accepted 5 March 2003

Pulsed-field gel electrophoresis, plasmid profiling, and phage typing were used to characterize and determine possible genetic relationships between 48 Salmonella enterica subsp. enterica isolates of pig origin collected in Catalonia, Spain, from 1998 to 2000. The strains were grouped into 23 multidrug-resistant fljB-lacking S. enterica serovar 4,5,12:i:- isolates, 24 S. enterica serovar Typhimurium isolates, and 1 S. enterica serovar 4,5,12:-:- isolate. After combining the XbaI and BlnI macrorestriction profiles (XB profile), we observed 29 distinct subtypes which were grouped into seven main patterns. All 23 of the 4,5,12:i:- serovar strains and 10 serovar Typhimurium isolates were found to have pattern AR, and similarities of >78% were detected among the subtypes. Three of the serovar Typhimurium DT U302 strains (strains T3, T4, and T8) were included in the same 4,5,12:i:- serovar cluster and shared a plasmid profile (profile I) and a pattern of multidrug resistance (resistance to ampicillin, chloramphenicol, streptomycin, sulfonamide, tetracycline, gentamicin, and trimethoprim-sulfamethoxazole) commonly found in monophasic isolates. This led us to the conclusion that strains of the S. enterica 4,5,12:i:- serovar might have originated from an S. enterica serovar Typhimurium DT U302 strain.

* Corresponding author. Mailing address: Unitat de Patología Infecciosa, Departament de Sanitat i Anatomia Animals, Facultat de Veterinària, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain. Phone: 34935811046. Fax: 34935813297. E-mail: eugenia.delatorre{at}uab.es.

Journal of Clinical Microbiology, June 2003, p. 2395-2400, Vol. 41, No. 6
0095-1137/03/$08.00+0     DOI: 10.1128/JCM.41.6.2395-2400.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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