Surveillance and antimicrobial resistance of Salmonella strains isolated from slaughtered pigs in Spain.
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).
Astorga
Rafael Jesús Márquez
RJ
Animal Health Department (Infectious Diseases), Veterinary Faculty, Campus Univ. Rabanales, Cordoba 14071, Spain. sa1asmar@uco.es
Salaberria
Aurora Echeita
AE
García
Alfonso Maldonado
AM
Jimenez
Silvia Valdezate
SV
Martinez
Alfonso Carbonero
AC
García
Ana Aladueña
AA
Casas
Antonio Arenas
AA
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*
D000900:Anti-Bacterial Agents