Serovars of Salmonella Isolated from Poultry between 2005 and 2008 and their Antimicrobial Resistance

Abstract

Nontyphoidal Salmonella is recognized as one of the principal causes of foodborne infections worldwide. Great concerns have been raised regarding emerging antimicrobial resistance among Salmonella that may result in unpredictable antimicrobial susceptibility and failure of therapy. The present study was carried out to evaluate the prevalence of Salmonella serovars and their antimicrobial resistance profiles isolated from . All the isolates (n = 33) were subjected to PCR typing using specific Salmonella primers for the most representative serotypes according to the epidemiological data. Representative isolates of Salmonella Typhimurium (n = 4) and Salmonella Enteritidis (n = 29) were tested for susceptibility to 12 antimicrobials, and isolates were classified susceptibile, intermediate or resistant based on BSAC guidelines. No resistance was observed to ciprofloxacin, cephalexin, cephotaxime, kanamycin, gentamicin and trimethoprim/sulfametoxazole. Higher frequencies of resistance were observed for nalidixic acid (36.36%), streptomycin (9.09%), ampicilin (3.03%), amoxicillin (3.03%), tetracycline (3.03%). Salmonella Enteritidis isolates from poultry showed resistance to nalidixic acid, ampicilin, amoxicillin, tetracycline, cloramfenicol and streptomycin, and Salmonella Typhimurium only resistance for streptomycin. An absence of resistance to cephalosporins, aminoglycosides, third generation of fluorquinolones and trimethoprim/sulfametoxazole and a low proportion of isolates resistant to, ampicilin, amoxicillin, tetracycline, and cloramfenicol are encouraging findings from public health and animal health perspectives. Frequent resistance observed for nalidixic acid and streptomycin, antimicrobials commonly used in veterinary medicine for decades, indicates an urgent need to utilize these antimicrobials more prudently if their benefits are to be preserved.