Surveillance and Antimicrobial Resistance of Salmonella Strains Isolated from Slaughtered Pigs in Spain

• Published in: Journal of food protection 2007-06, Vol.70 (6), p.1502-1506
• Main Authors: Astorga Marquez, R.J, Echeita Salaberria, A, Maldonado Garcia, A, Valdezate Jimenez, S, Carbonero Martinez, A, Aladuena Garcia, A, Arenas Casas, A
• Format: Article
• Language: English
• Subjects: Animal productions; Animals; Anti-Bacterial Agents - pharmacology; antibiotic resistance; antibiotics; bacterial contamination; Biological and medical sciences; Colony Count, Microbial; Disease Reservoirs - veterinary; Dose-Response Relationship, Drug; Drug Resistance, Bacterial; Drug Resistance, Multiple, Bacterial; Food Contamination - prevention & control; Food industries; Food microbiology; food pathogens; Fundamental and applied biological sciences. Psychology; Humans; isolation; Microbial Sensitivity Tests; multiple drug resistance; pig carcasses; pork; Prevalence; Salmonella - drug effects; Salmonella enterica; Salmonella enterica - drug effects; Salmonella typhimurium; serotypes; Serotyping; slaughterhouses; Spain; swine; Swine - microbiology; Terrestrial animal productions; Vertebrates
• ISSN: 0362-028X; 1944-9097
• DOI: 10.4315/0362-028X-70.6.1502

The prevalence of and the antibiotic resistance shown by Salmonella isolated from pigs in Andalusia (southern Spain) is reported. Salmonella enterica was recovered from 40 (33%) of 121 sampled herds, and a total of 65 isolates were serotyped. The most common Salmonella serotypes were Typhimurium and Rissen (30.7% each); others included Derby (9.2%), Brandenburg (9.2%), Newport (7.7%), Bredeney (4.6%), Anatum (3.0%), Hadar (1.5%), and Gold-coast (1.5%). One strain (1.5%) belonging to the monophasic variant of the Typhimurium serotype (Salmonella 4,5,12:i:-) was also detected. Definitive phage type (DT) 104b was the most common Typhimurium phage type isolated. These Salmonella strains were resistant to various antimicrobial agents, including tetracycline (84.6%), streptomycin (69.2%), neomycin (63.0%), sulfonamides (61.5%), ampicillin (53.8%), and amoxicillin (53.8%). All isolates were fully susceptible to ceftriaxone, ciprofloxacin, and colistin. Thirtynine strains (64%) resistant to four or more antimicrobial agents were defined as multidrug resistant. Multidrug resistance profiles were observed in Salmonella serotypes Typhimurium, Rissen, Brandenburg, Bredeney, a monophasic variant, Gold-coast, Hadar, and Anatum, with serotypes Typhimurium and Brandenburg showing the most complicated resistance patterns (resistant to greater than or equal to 11 drugs).