Document Type : Original Article
Authors
1
Professor of Microbiology, Department of Bacteriology, Immunology, and Mycology, Faculty of Veterinary Medicine, Suez Canal University.
2
Department of microbiology, Animal Health Research Institute Zagazig branch
3
researcher assistant of microbiology ,animal health institute Ismailia branch
Abstract
Avian pathogenic Escherichia coli (APEC) is responsible for a range of systemic and localized infections, presenting with varied clinical manifestations including coli granuloma, polyserositis, air vasculitis, and septicemia. Colibacillosis leads to substantial financial losses in the poultry sector, as it contributes to poultry deaths, poor feed efficiency, and contamination of carcasses, all of which necessitate disease management efforts. In this research, 30 E. coli strains were isolated from 50 diseased turkey poults. All bacterial isolates underwent antimicrobial susceptibility testing, and serotyping was conducted on thirty multidrug-resistant (MDR) strains. A significant level of resistance was most commonly detected against doxycycline, chloramphenicol, and amoxicillin-clavulanic acid. Multidrug resistance was found at a rate of 83.33% (25/30). Of the 30 strains successfully serotyped, the most commonly identified serogroups were O78 and O1, each accounting for 20% (6 out of 30) of the total, while the O18, O113, and O119 rates were 10%. In the same time, O103, O111, O25, and O26 rates were 6.6%, detected as rare serogroups. The O78 serotype was identified as both a predominant type within the selected E. coli isolates and exhibited elevated resistance to antibiotics. Five O78 were subjected to detection of four resistance genes: blaTEM, floR, mphA, and tetA (A). All five have tetA (A) and floR, while four isolates have blaTEM and mphA.
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