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Trichinellosis is a parasitic disease that affects animals and humans. Trichinella is a causative agent seen as a small round worm invisible to the eye. Trichinellosis affects pets and wild animals. Pigs, horses, dogs and synanthropic rats are seen to suffer from the disease more often among the domestic animals, and bears, wild boars, foxes, badgers and others – among the wild ones. . Human infection takes place when eating meat and meat products as raw dried homemade sausages and ham, kebabs, fried meat and other meat products contaminated with trichinell larvae. Infestation of wild animals is caused by predation or eating of dead animals. Pets are infected by eating slaughter products, food scraps and dead animals (rats). Trichinella are preserved in the animal muscles for some years. Badgers populations are seen as one of trichinosis reserves in Amur region. To determine specific features of trichinella larvae distribution in the lean tissue, the researchers explored the materials of 21 badgers from different areas of Amur region. The researchers used the heads or separate muscle groups for conducting the research. This is explained by remote location of many districts from the regional center. Trichinella larvae were detected by compressor trichinelloscopy and digestion in artificial gastric juice. The analysis showed that the number of trichinell larvae in the same muscle group does not depend on the side of the animal’s body, i.e. their number is almost identical on both the left and right sides. Invasion rate (IR) was defined as ratio of the number of infected animals to the total number of animals explored (in percentage). Invasion intensity (II) was determined by the number of trichinell larvae in 1 g of lean tissue (lye/g). The same method was used to investigate the distribution of trichinella larvae in 15 muscle groups of a badger. Invasion intensity in the infected animals was 14.3%. The largest number of trichinella larvae in a badger is concentrated in the head muscles, and there are no significant differences from the body part. The authors recommend to explore the badger carcasses and muscle sampling mainly from the head.

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The authors focus on the fight against the most common helminthic diseases of agricultural animals as they see it as an important part of the veterinary science. Bunostomosis is one of such diseases; it is a helminthiasis of ruminants caused by vipostomum trigonocephalum nematodes (in sheep and goats) and vipostomum phlebotomum (mainly in the cattle), which are parasitic in the small intestines. The disease is characterized by diarrhea, exhaustion and death of ruminants. The disease is widespread and causes great economic damage. The authors explored the prevalence of tuberculosis and age-related infection with tuberculosis by ovoscopy and levoscopy in the Amur region. They examined 2655 animals, including 1415 small ruminants and 1240 cattle from five districts of the Amur region. The researchers examined 4 calves and 4 lambs aged 4 inorder to study the period of bunostom development in the organism of animals, which were infected with percutaneously and orally. Brown larvae received from faeces of spontaneously infested animals is considered to be the material for infection. The development and survival of larvae in the environment were investigated in 2016-2017. The authors found out that in the Amur region larvae develop at the temperatures above 40С. The period of development at the temperature from 40С tо 9 0С was 23 days. When the temperature was increasing, the development period was reduced to 5-7 days. In October larvae stop their development. The underdeveloped eggs and larvae left die in winter. At the farms of the Amur region, the infection rate of cattle and sheep is 31.9 and 49.6%. The bunostome infection of the cattle aged 1-11 months is 59,8%; 1-2 years - 26,0; 3 years and more - 19,9; sheep aged 4-11 months infection rate is 52,9; 1 year - 60,9, 3 years and more - 38,7%. The authors observed bunostomes development during 89-102 days in the ruminant organism before the sexually mature stage in the conditions of the Amur region.