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The results of a microbiological study of sexually mature ixodid mites of the genus Dermacentor collected in the rural areas of the Trans-Baikal Territory are presented. Microbiological examination of 152 ixodid mites was carried out. Four microbial cultures of different species were identified: Listeria monocytogenes, E. coli, Salmonella typhi, Clostridium botulinum. The presence of bacteria associations of different species groups in the mite body was noted: in 32 individuals - L. monocytogenes, E. coli, S. typhi, in 56 - C. botulinum, E. coli, S. typhi, in 6 - L. monocytogenes, E. coli, in 15 - C. botulinum, E. coli. Of all the isolated microbial strains, Escherichia coli made up the largest number: this microorganism was isolated from all mites. L. monocytogenes appeared to be the least isolated: 38 of 152 mites were its carriers. Salmonellosis pathogen circulation was detected in 123 mites out of 152 examined specimens. The biological properties of all the isolated microbial cultures corresponded to their classical characteristics. Microorganisms of the genus Clostridium isolated from the mites on the Kitt-Tarozzi nutrient medium caused uniform turbidity of the nutrient medium, which indicates that this bacterial strain belongs to serovars C, D, E and В. The data obtained indicate the need for annual veterinary control of the grazing areas for the presence of natural foci, the reservoirs of pathogens which are pasture mites. During the period of ixodid mites mass attack it is necessary to carry out acaricide treatments of animals with repellent and acaricide preparations that will not only increase their productivity, but will also allow preventing infectious diseases.

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A comprehensive veterinary study of the wild pig population on the territory of the Trans-Baikal Territory for helminthiasis and microbial transmission was carried out. The helminth fauna of wild pigs was studied and the circulation of bacterial pathogens in the population of these animals was established. The object of the research were materials obtained in the field studies on the Trans-Baikal Territory districts. The study of endoparasite infestation was conducted in 37 wild pigs aged 6 months to 3 years during 2019-2021. Infestation of wild pigs with eight different types of helminths was registered on the Trans-Baikal Territory. The maximum extent of infestation (32.4%) was recorded in Setaria labiato-papillosa. Wild pigs are infected with both imaginal helminths Setaria labiato-papillosa, Metastrongylus elongatus, Ascaris suum, Trichocephalus suis, Oesophagostomum dentatum, as well as with helminth larvae Cysticercus tenuicollis and Cysticercus cellulosae. The study of the morphology of sexually mature pathogens indicates parasitization of helminths of the genus Setaria labiato-papillosa in pigs. Out of 37 wild pigs studied, the association infestation of setariosis + ascaridosis was recorded in 12 animals, three pigs were simultaneously parasitized by ascaridosis + trichocephalus, and two animals had the association of setariosis + metastrongylosis.Organoleptic examination of carcasses of pigs affected by associative infestation showed a 2-fold or more reduction in the thickness of the backbone and side fat in comparison with helminth-free animals. In pigs infected with ascaridosis and metastrongylosis, microbial cultures of S. typhimurium and E. rhusiopathiae were isolated from paraenchymatous organs. Parasite ecosystems with different types of helminths and helminths + highly pathogenic bacteria have been recorded in the body of wild pigs.

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