Antimicrobial resistance of Salmonella strains isolated from pork products

Abstract

<p>The objective of this study was to assess the antibiotic resistance pattern in Salmonella strains isolated from sausages and pork cuts processed in the same slaughterhouse in Rio Grande do Sul, Brazil. The agar diffusion method was used to test ten different serovars isolated from sausages (n= 127) or from pork cuts (n=62) against 14 antimicrobial drugs. Resistance to sulphonamide (54.0%), tetracycline (35.4%), streptomycin (31.2%), nalidixic acid (28.0%), sulphametoxazole/trimethoprin (24.9%), neomycin (22.2%), chloramphenicol (22.2%), ampicillin (20.6%), tobramycin (19.6%), cefaclor (14.3%), gentamicin (9.5%), amoxacillin/clavulanic acid (5.8%), amikacin (4.2%) and ciprofloxacin (2.1%) was observed. The multiresistance pattern (resistance against at least four antibiotics) was found in 39% of Salmonella strains. The multiresistance pattern was more common in pork cut isolates (62.9%) than in sausage isolates (27.5%). Strains of S. Bredeney and S. Panama, the two most isolated serovars in this study, showed the highest number of multiresistant strains (39.3% and 42.5%, respectively).</p>