This review was conducted togive an overview of the current state of knowledge on Sarcocystis infectivity, pathogenicity, and transmissibility here, based on our current understanding virulence. Sarcocystis species are parasitic protozoa. Sarcocystis is about 220 species that may be found all over the world. Heteroxen and protozoan parasites Sarcocystis spp. develop cysts in intermediate hosts’ tissues and are thrown out as sporocysts with definitive hosts. Herbivores, which are their intermediate hosts, have cysts in their hearts, oesophagus, diaphragms, tongues, jaws, and other skeletal muscles. In general, canid-transmitted Sarcocystis spp. are more pathogenic than felid-transmitted Sarcocystis spp. Fever, anemia, weight loss, decreased wool quality and milk output, and abortion are all signs of intermediate hosts.