title: Surveillance and antimicrobial resistance of Salmonella strains isolated from slaughtered pigs in Spain.
abstract: 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 Goldcoast (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. Thirty-nine 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 > or = 11 drugs).
authors.affiliation: Animal Health Department (Infectious Diseases), Veterinary Faculty, Campus Univ. Rabanales, Cordoba 14071, Spain. sa1asmar@uco.es
authors.forename: Rafael Jesús Márquez
authors.initials: RJ
authors.lastname: Astorga
authors.forename: Aurora Echeita
authors.initials: AE
authors.lastname: Salaberria
authors.forename: Alfonso Maldonado
authors.initials: AM
authors.lastname: García
authors.forename: Silvia Valdezate
authors.initials: SV
authors.lastname: Jimenez
authors.forename: Alfonso Carbonero
authors.initials: AC
authors.lastname: Martinez
authors.forename: Ana Aladueña
authors.initials: AA
authors.lastname: García
authors.forename: Antonio Arenas
authors.initials: AA
authors.lastname: Casas
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D015169:Colony Count, Microbial; D004197:Disease Reservoirs / Q000662:veterinary*; D004305:Dose-Response Relationship, Drug; D024881:Drug Resistance, Bacterial; D024901:Drug Resistance, Multiple, Bacterial; D005506:Food Contamination / Q000517:prevention & control; D006801:Humans; D008826:Microbial Sensitivity Tests; D015995:Prevalence; D012475:Salmonella / Q000187:drug effects*; D019779:Salmonella enterica / Q000187:drug effects*; D012703:Serotyping; D013030:Spain; D013552:Swine / Q000382:microbiology*
chemical_list: D000900:Anti-Bacterial Agents