This is a new and fully revised edition of Jeffrey and Leach: Atlas of Medical Helminthology and Protozoology . Helminths (worms) and similar parasites are a major medical problem in much of the world and perhaps the largest single cause of morbidity and mortality (eg malaria, elephantiasis, trypanosmiasis). The diagnosis of these conditions still largely rests on the microscopic examination of, for example, faeces. This atlas illustrates the different myriad of different organisms and how to identify them. The atlas covers all helminths and protozoa of medical importance. For each the life cycle is illustrated along with the microscopic appearance of all the various stages. Brief notes are given on the pathology, diagnosis and worldwide distribution for each organism.