Sporozoa in animals with particular reference toToxoplasmaandSarcocystis

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Abstract
Extract Symptomatic and asymptomatic infections by Toxoplasma and Sarcocystis have been recognized for many years, but it has been only within the last few years that the life-cycles and natural means of perpetuation of some of these species have been worked out. The initial breakthrough resulted from the astute observation of Hutchison ( 1965 Hutchison, W. M. 1965. Experimental transmission of Toxoplasma gondii. Nature (Lond.), 206: 961–962. [Google Scholar] ) who demonstrated a resistant form of Toxoplasma in cat faeces. Hutchison and co-workers and other groups in the United States and elsewhere later demonstrated that Toxoplasma cysts on ingestion by susceptible cats went through a typical coccidial cyclein the epithelium of the small intestine. Following on these observations workers in Germany, followed by others in the U.S.A. and Australia, have demonstrated a similar intestinal cycle for several members of the genus Sarcocystis, in several species of meat-eating animals.