**1. Introduction**

472 A Bird's-Eye View of Veterinary Medicine

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Protozoa are ubiquitous throughout aqueous environments and the soil, and play an important role in their ecology. Protozoa occupy a range of trophic levels.They also play a vital role in controlling bacteria population and biomass. Farm animals are usually infected with several species of parasites and they are also confined to pasture or pens. Parasite eggs, larvae, and cysts are intense in soil. One of the most important aspect of animal protozoology is transmission to humans. These are called zoonosis. Some of zoonotic diseases are common and important to public health. This chapter is about of the etiology, epidemiology, pathogenesis, clinical findings, diagnosis, treatment and control of the pathogenic protozoa in farm ruminants.
