Abstract
The development of Theileria sergenti, Babesia ovata, and Babesia gibsoni in their vertebrate hosts, and in the tick vector, Haemaphysalis longicornis is investigated. Three forms of T. sergenti are noted in host erythrocytes, the bacillus-like, coccus-like and rod-like forms. In the tick vector, T. sergenti goes through gametogony (ring, and round forms, microgamete, macrogamete and zygotes) in the gut, and sporogony (primary, secondary and tertiary sporoblasts, and sporozoites) in the salivary glands. Morphologically, merozoites of B. ovata are classified into four types: single pyriform, budding form, paired pyriform and crisis form. In tick host infected with B. ovata, two growth stages can be observed, gametogony (ring, spherical, fission, bizarre and elongate forms, microgamete and zygote) in the gut, and sporogony (sporont and sporozoites) in the salivary glands. In its tick vector, B. gibsoni undergoes gametogony (ring, spherical, fission, bizarre, elongate forms, microgamete, and zygote) in the gut.
