Gnathostoma: A genus of parasitic nematodes that occurs in mammals including man. Infection in humans is either by larvae penetrating the skin or by ingestion of uncooked fish.Gnathostomiasis: Infections with nematodes of the genus GNATHOSTOMA, superfamily THELAZIOIDEA. Gnathostomiasis is a food-borne zoonosis caused by eating undercooked or raw fish or meat.Spirurida Infections: Infections with nematodes of the order SPIRURIDA.Cypriniformes: An order of fish with 26 families and over 3,000 species. This order includes the families CYPRINIDAE (minnows and CARPS), Cobitidae (loaches), and Catostomidae (suckers).Angiostrongylus: A genus of parasitic nematodes of the superfamily METASTRONGYLOIDEA. Two species, ANGIOSTRONGYLUS CANTONENSIS and A. vasorum, infest the lungs of rats and dogs, respectively. A. cantonensis is transmissible to man where it causes frequently fatal infection of the central nervous system.Thelazioidea: A superfamily of parasitic nematodes which includes three genera: Thelazia, Spirocerca, and GNATHOSTOMA. Only Thelazia and GNATHOSTOMA occasionally occur in man.Central Nervous System Parasitic Infections: Infections of the brain, spinal cord, and meninges caused by parasites.Larva Migrans: Infections caused by nematode larvae which never develop into the adult stage and migrate through various body tissues. They commonly infect the skin, eyes, and viscera in man. Ancylostoma brasiliensis causes cutaneous larva migrans. Toxocara causes visceral larva migrans.Eye Infections, Parasitic: Mild to severe infections of the eye and its adjacent structures (adnexa) by adult or larval protozoan or metazoan parasites.Nematode Infections: Infections by nematodes, general or unspecified.Antibodies, Helminth: Immunoglobulins produced in a response to HELMINTH ANTIGENS.Larva: Wormlike or grublike stage, following the egg in the life cycle of insects, worms, and other metamorphosing animals.Antigens, Helminth: Any part or derivative of a helminth that elicits an immune reaction. The most commonly seen helminth antigens are those of the schistosomes.