The document discusses different types of nematodes (roundworms) that can infect humans, including where they live in the body, their life cycles, modes of transmission, associated clinical features and treatment. It covers intestinal nematodes like ascariasis, trichuriasis and hookworms, tissue-dwelling nematodes like filariasis, and strongyloidosis. Prevention involves improving hygiene, sanitation and health education. Common drugs used for treatment include mebendazole, albendazole, pyrantel pamoate and levamizole.