parasitic disease

A parasitic disease is an infection or infestation by parasites, usually referring to nonbacterial and nonviral agents (i.e., to protozoa and helminths). malaria, leishmaniasis, trypanosomiasis (see trypanosomes), chagas' disease, filariasis, schistosomiasis, toxoplasmosis, amebiasis, and tapeworm are common examples. Manifestations may depend on the life cycle of the parasite; animal or insect vectors are usual. Chemotherapy is often an effective treatment.