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A total of (236 swabs) fecal samples from El-Menofiya and El-Kalubia Governorates, as sporadic cases of were subjected to bacteriological, biochemical, serotyping, sensitivity testing and PCR detection of resistance genes for β-Lactames and Quinolones. Ten isolates of Salmonella species were identified, as 7 isolates (4.7%) from calves (Salmonella Typhimurium, Salmonella Enteritidis, Salmonella saintpaul, Salmonella Langeveld and Salmonella Havana), 2 isolates (3.6%) from lambs (Salmonella Typhimurium, Salmonella Bardo) and one isolate (3.3%) from goat-kids (Salmonella Enteritidis) Salmonella isolates sensitivity to β-lacatmes was 0.00% for ampicillin, penicillin G, piperacillin, cephalexin, cefoxitin, ampicillin-sulbactam, ceftazidime, 10% for ceftriaxone and 20% for amoxicillinclavulanic acid, increased to 60% and 100% for aztreonam, imipenem respectively. Susceptibility of isolates to quinolones were 10% for ciprofluxacin, 20% to nalidixic acid, and 100% for each of norfloxacin and levofloxacin. PCR study showed beta-lactamase encoding gene, bla (TEM-1), was identified in 90% and the extended-spectrum beta-lactamase, (CIT) in 20% while bla (SHV) and acc in 80% of isolates. The detection was 50%, 40%, and 0.00% for FOX, MOX, and bla (OXA-1) genes, respectively. Plasmid-mediated quinolone resistance, qnrB, qnrS were detected in 80% while aac(6')Ib-cr, was only in 50% of the isolates. Results showed a high incidence of β-lacatmase than quinolones resistance genes and higher isolate susceptibility to quinolone than to β-lacatmes which indicates higher efficacy and validity of quinolones. Results indicates quinolones LEV and NOR in addition to βlacatmes imipenem are the drugs of choice for suspected salmonella cases.

benha veterinary medical journal

Molecular characterization of Quinolones and β-Lactams Resistant Salmonella Serovars Determinants in Diarrheic Calves, lambs and goats-kids in the Middle of Nile Delta, Egypt