The determination of enterotoxigenic virulence genes, serotypes, and antibiotic susceptibilities of Escherichia coli isolates from neonatal calf septicemia

İngilizce (OpenAlex)

This study was conducted for the isolation of E. coli from calves with neonatal septicemia, the determination of antibiotic resistance, common serotypes and virulence factors. For this purpose, important serotype genes, virulence genes and resistance genes of 8 different antibiotics in calves with septicemia in confirmed isolates analyzed by PCR. According to the phenotypic antibiotic resistance analysis, the isolates were 94,7% streptomycin, 93,7% tetracycline, 89,5% ampicillin, 87,4% trimethoprim-sulfamethoxazole, 87,4% chloromphenicol, 74,7% enrofloxacin, 62,1% gentamicin and 24,2% was found to be resistant to cephalothin. In isolates, 88.4% tet(B), 74.7% sul3, 67.4% sul1, 61% cmlA, 56.8% qnr(B), 54.7% tet(A), 53.7% sul2, 38.9% CITM, 36.8% aadA1, 28.4% cat1, 26.3% qnr(S), 12.6% aac[3]-IV, 5.3% tet(C) and 1.05% qnr(A) genes were identified. According to the presence of O101, O26 and O145 serotype genes, the isolates were found to be 33.7%, 6.3% and 2.1%, respectively, as a result of serogenotyping. As a result of PCR studies carried out to determine virulence genes; It was determined that 23.2% isolates had East1, 22.1% isolates F5, 20% isolates STa, 17.9% F41 and 3.2% isolates LT. Thus, the presence, prevalence of ETEC in calves with neonatal septicemia in the sampling region, the pathotype/virotype distribution of the isolates were determined and the most appropriate antibiotic option that could be used in the treatment of disease.