University of Khartoum

Transmission of Bovine Theilerial Parasites in the Sudan

Transmission of Bovine Theilerial Parasites in the Sudan

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Title: Transmission of Bovine Theilerial Parasites in the Sudan
Author: Um El Hassan Mustafa El Niema, El Niema
Abstract: Isolation of two Theileria spp. was made by inoculation of blood from naturally infected cattle into susceptible calves. Using IFA test, the two parasites were identified to be T. annulata and T. mutans. This is the first time presence of these parasites has been confirmed in the Sudan. Transstadial transmission of T. annulata was achieved with laboratory reared and field collected H. a. anatolicum. T. annulata sporozoites harvested from infected H. a. anatolicum larvae and nymphs successfully produced infections in susceptible calves. Transovarian transmission of T. annulata with H. a. anatolicum larvae derived from field collected adults and nymphs were achieved on three occasions. Experiments to demonstrate transovarian transmission with laboratory reared H. a. anatolicum were unsuccessful. Transstadial transmission of T. annulata was also made by H. m. rufipes, H. dromedarii and H. impeltatum. At present, the importance of these ticks as vectors cannot be assessed but it is likely that their role in the epidemiology of tropical theileriosis is insignificant, as their immature stages do not normally feed on cattle. T. annulata was found to be highly pathogenic to susceptible high-grade Friesian calves causing a mortality of over 80%. A. lepidum was demonstrated for the first time to be a vector of T. mutans. This parasite was also transmitted transstadially. On one occasion only H. a. anatolicum and Rhipicephalus evertsi transmitted this parasite transstadially. The significance of this finding was not determined. T. mutans was found to be non-pathogenic to splenectomized susceptible high grade Friesian calves.
URI: http://khartoumspace.uofk.edu/handle/123456789/14395
Date: 2015-06-23


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