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Invasion of the Central Nervous System (CNS) by African trypanosomes represents a critical step in the development of human African trypanosomiasis. The study aimed ats assessing the role of tubulin vaccine candidate in protection of cattle against trypanosomiasis using Trypanosoma brucei brucei subspecies that is highly related to Trypanosoma brucei gambiense and Trypanosoma brucei rhodesiense that cause sleeping sickness in man. The tissue behavior and cerebral fate of T. b. brucei in cattle should mimic the situation in humans and since cattle are also natural hosts for trypanosomes, it was envisaged that the cattle system would be a more suitable model for vaccination studies than the rodent model. Experimental infection of tubulin vaccine candidate vaccinated and non-vaccinated Ankole long horn cattle breed calves was done using a Trypanosoma brucei brucei parasite strain that had been previously isolated from naturally infected cattle in Uganda. Trypanosomiasis disease progression and associated pathology were assessed by clinical and extensive post mortem examinations. Marked organ abnormalities and severe lesions were observed in the non-vaccinated cattle, however, the findings revealed that tubulin vaccination in cattle lowers tissue parasitiasis and ameliorates the inflammatory pathology and clinical signs of trypanosomiasis by Trypanosoma brucei brucei. The trypanosome tissue invasion may be susceptible to immunological attenuation.

journal of vaccines, immunology and immunopathology

Tubulin vaccinated Ankole cattle develop less severe lesions than the non-vaccinated cattle when experimentally infected with Trypanosoma brucei brucei