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The protozoan is a unicellular animal, most are very small many are somewhat larger in size. The tissue protozoa are one of the main determinative factors affecting animal health which cause serious economic losses among farm animal industry all over the world, especially at production time. At the same time, the infected animal meat may serve as an important source of infection to man during handling or if consumed undercooked. The protozoa in animal tissue in this review are classified into 1- blood and tissue protozoa (Trypanosoma, Leishmania, Sarcocystis, Toxoplasma, Neospora, Hammond,...

Cryptosporidium species are apicomplexan parasites that infect the microvillus border of the gastrointestinal epithelium of a wide range of vertebrate hosts, including humans.Infected individuals show a wide spectrum of clinical presentations, but the pathogenicity of Cryptosporidium varies with the species of parasites involved and also the type, age, and immune status of the host. Cryptosporidium infections are associated with only acute, self-limiting illness while in animals or individuals who are immune-suppressed; the infection is frequently chronic and can eventually be lethal....