EN
The studies were carried out on 300 adult foxes and 1115 young foxes. On the basis of coproscopic examinations and at necropsy there was found Toxocara infection in 94% of adult foxes, Toxocara canis in 13%, Uncinaria stenocephala vulpis and Dipylidium caninum in 13%. Young foxes aged 5—6 weeks were infested with Toxocara canis and Uncinaria stenocephala in 13% while in the animals 10—12 weeks old infestation with these parasites was 86% and 5% respectively. A high effectiveness of oxyphendazole (96%) against Toxocara canis was found at the rate of 10—11.3 mg/ kg body weight. Pyrantel tartrate administered at a dose of 10 mg/kg reduced Toxocara canis infestation in 86% of animals. Foxes given the drug at the rate of 100 mg/kg body weight did not show any signs of poisoning; there was not found any changes in the blood either. Oxyphendazole administered at a dose of 200 mg/kg caused apathy, somnolence, fasten breathing and vomiting. These signs disappeared after 6 hours without treatment. In contrast, pyrantel tartrate given at the rate of 200 mg/kg resulted in acute signs of poisoning and within an hour all animals treated (one group) died.