The causative agents of trichinellosis are roundworms of the Trichinellidae family, which includes two species - Trichinella spiralis with three varieties (T. s. spiralis, T. s. nativa, T. s. nelsoni) and Trichinella pseudospiralis. In the pathology of the population of Ukraine, T. s. spiralis and G. s. nativa are of greatest importance. Trichinella s. spiralis is widespread, parasitizes domestic pigs, and is pathogenic for humans.