Opisthorchiasis is a parasitic disease caused by worms of the genus Opisthorchis. The main product of infection is fish of the cyprinid family. The mild form is asymptomatic. The severe form is accompanied by abdominal pain, lack of appetite, fever, fatigue, yellowing of the skin and whites of the eyes. In the future, edema, enlargement of the gallbladder, and liver damage are possible. Opisthorchiasis is associated with bile duct cancer.

Toxocariasis is a disease caused by the larvae of Toxocara roundworms. Infection comes from dogs, cats or foxes. Transmission to humans usually occurs by ingestion of helminth eggs. The mild form is asymptomatic. In the severe form, there is a decrease in immunity, cough, fever, abdominal pain, headache, drowsiness, inflammation of internal organs and the central nervous system.

Echinococcosis is a disease caused by Echinococcus tapeworms. The intermediate hosts of the helminth are herbivores, dogs are the final hosts, and humans are the accidental hosts. The disease can be asymptomatic for a long time. With echinococcosis, the liver is affected in 75% of cases, in 5-15% the lungs, and in 10-20% - other organs - the spleen, brain, heart and kidneys. Patients develop fluid-filled cysts. Clinical manifestations of the infection depend on the location of the cysts and their size. Immunoenzymatic analysis of blood allows to detect antibodies of the IgG class to helminths - opistarchs, toxocars, trichinella and echinococci. The analysis helps to differentiate worm infestation and establish a diagnosis.