To study the spread of helminth infections and diagnosis of the helminth fauna in pri-vate horse breeding farms of the Leningrad Region, feces were survey studied from foals for a year, animals aged 1 year to 3 years, 3 years to 6 years old, 6 to 10 years old and over 10 years old. Gastrointestinal nematodoses were diagnosed using Dar-ling`s method with advanced flotation fluid, culturing larvae by the method of Petrov& Gagarin, and using microscopy of contents from perianal area.The dominance of gastro-intestinal strongylides in horses of all age groups has been found. Yearlings are infest-ed with trichonemas by 94.1%.Aling with age increasing, the intensity of invasion (II) is slightly reduced. In horses older than 10 years, the prevalence rate of trichonemic infection is 63.9%. Strongyloidosis was de-tected in 70.5% of foals up to a year old.At the age of one to 3 years, a slight decline in II is observed, but when reaching 3 years and further, with increasing age, II gradually increases. Horses from 3 to 6 years of age (II = 80.0%) are more infected with parascaris-es. Yearlings are infested with parascarises by 56.2%, and in horses older than 10 years, II is 30.7%.Horses are less infested with ox-yurises compared to other nematodes.The lowest levels of II by oxyurosis (23.5%) were found in yearlings, and most of all ani-mals were invaded at the age of 6 to 10 years (II = 50.0%).It should be noted that helminth fauna is formed by nematodes, which are geohelminths in the terms of their develop-mental biology.Perhaps there is a correlation between the invasion of horses of all age groups and the characteristics of keeping animals in small private farms.
Prevalence of Virulence Plasmids in Environmental Isolates of Rhodococcus equi from Horse-Breeding Farms in Hokkaido.