Since 1933, when he earned his doctorate in Biology at Harvard, Trager has consistently pioneered at the frontiers of parasitological research and his career has been characterized by a continuum of notable contributions, particularly in the areas of the biochemistry and cultivation of protozoa. He is unique in his field. Now drawing from a vast personal experience and from his intimate knowledge of the subject of parasitology he provides a fascinating overview of current knowledge of the interactions between parasites and their hosts, i.e., the phenomena of parasitism. The emphasis is on the physiology, biochemistry, and cell biology of host-parasite relationships, subjects that Trager considers the main focus of future work in parasitology.
Approximately half of the text deals with the establishment of infection, the determinants of site selection, the host-parasite interface of extracellular and intracellular parasites, metabolic processes, nutritional requirements, and the cultivation of parasites.