Clinical parasitology is the study of important parasites which causes diseases to humans (classification, symptoms, disease, lifecycle, transmission, treatment). Infections of humans caused by parasites number in the billions and range from relatively harmless to fatal. The diseases caused by these parasites constitute major human health problems throughout the world. (For example, approximately 30% of the world's population is infected with Ascaris lumbricoides.) Other parasitic illnesses have increased in importance as a result of the AIDS epidemic. The location of the parasite is mainly found at the tips of the intestinal villi and they never found at the crypts. Parasitic infections are usually diagnosed from samples of faeces, urine, blood and tissue. Tests commonly in use include the complement fixation test (CFT), immunodiffusion (ID), indirect haemagglutination (IHA), indirect immunofluorescent antibody test (IFA), enzyme-linked immunosorben t assay (ELISA) and radioimmunoassay (RIA) (137) (Table I). Less frequently used tests include latex agglutination, capillary agglutination and card agglutination.