Genus Babesia, commonly known as Babesiosis, is a parasitic disease that affects the red blood cells of mammals. Babesiosis is transmitted by ticks, and it can cause a range of symptoms from mild to severe. Several other terms may refer to the Genus Babesia, such as Theileria, Cytauxzoon, and Hepatozoon. These protozoan parasites share many similarities with Babesia, and they also infect the red blood cells of animals. The genus Theileria and Babesia are closely related, and they cause similar hemolytic diseases in cattle. Cytauxzoon and Hepatozoon, on the other hand, cause similar diseases in cats and dogs, respectively.