Pathogens microbiological spectrum in gastrointestinal pathology in animals

When studying the microbiological spectrum of causative agents of gastrointestinal pathology in animals, bacteria of the Enterobacteriaceae family are isolated, a number of which cause diseases such as colibacillosis, salmonellosis, yersiniosis, proteus infection, and others. On the basis of the Omsk Regional Veterinary Laboratory, the species composition of enterobacteria isolated from gastrointestinal diseases of farm animals in different regions of the Omsk Region was studied. Cultures were isolated from material from large and small cattle, pigs, horses and poultry with gastrointestinal diseases. Samples were taken from animals of various age groups, but special attention was paid to the study of the microbiocenosis of young cattle. In the period from 2016 to 2020, 12 species of enterobacteria belonging to 9 genera were isolated: Citrobacter, Escherichia, Enterobacter, Hafnia, Klebsiella, Proteus, Salmonella, Shigella and Yersinia. The belonging of bacteria of the genus Escherichia to serotypes was determined using diagnostic O-coliagglutinating sera. Enteropathogenic Escherichia serotypes isolated from cattle amounted to 64.3 %, from pigs - 58.6 %, only single pathogenic serotypes were isolated from horses and small cattle. The isolated cultures had varying degrees of pathogenicity, which was determined by inoculation on blood agar and bioassay on laboratory animals. The sensitivity of cultures to antibacterial drugs was studied using the disk diffusion method (DDM). Most isolated cultures of enterobacteria were found to be sensitive to gentamicin, chloramphenicol, ciprofloxacin, and streptomycin. A significant part of enterobacteria showed resistance to azithromycin, lincomycin and enrofloxacin.