The Results of Epizootological and Epidemiological Monitoring of Toxocarosis in the South of Russia

The purpose of the research is to study the contamination of environmental objects and Toxocara canis transmission in the occurrence of the people’s risk of becoming infected.Materials and methods. 481 fecal samples of anonymous dogs were studied for the period from 2011 to 2015 in order to determine the rate of Toxocara sp. infection in dogs in various territories on the south of Russia (the Rostov Region, the Krasnodar Territory, the Republic of Adygea and Karachay-Cherkessia). Fecal samples were taken in the spring-summer time from the territories of private residences. Helminthovoscopic studies of fecal samples were carried out by the Fulleborn method using a saturated solution of sodium nitrate, and ether-formalin sedimentation method using concentrators of the MiniParasep system. To calculate the number of Toxocara sp. eggs in 1g of feces, a VIGIS camera was used. Seroepidemiological diagnostics of 5194 blood serums of southern Russia population deemed to be healthy was carried out in order to identify specific class G antibodies to T. canis for 2011–2018. Toxocara-IgG-IFA-BEST reagents were used as diagnostic test systems. Enzyme immunoassay was performed according to the instructions.Results and discussion. In the study of 481 samples of depersonalized feces of dogs in various territories of southern Russia, the proportion of positive samples averaged 29.31%, while the proportion of samples with T. canis eggs ranged from 6.0% in the Krasnodar Territory to 16.7% in the Republic of Adygea. Toxocara sp. eggs were found in 42.2% of samples. The analysis showed the fluctuations in the incidence of toxocarosis from 1.33 in 2014 to 2.19 in 2018 per 100 thousand. The seropositivity level of the examined individuals was in the range of 19.5–40.9% in the Rostov Region, 17.0–25.0% in the Astrakhan region, 21.78–37.11% in the Krasnodar Territory, 22.5–47.0% in the Republic of Adygea, 34.0–42.27% in the Karachay-Cherkess Republic, 13.8% in the Chechen Republic and 19.9% in the Republic of Crimea