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. 1984 Feb;51(2):247–258.

Anti-trypanosome specific immune responses in bovids of differing susceptibility to African trypanosomiasis.

M Pinder, G Libeau, W Hirsch, I Tamboura, R Hauck-Bauer, G E Roelants
PMCID: PMC1454421  PMID: 6693134

Abstract

A clone of Trypanosoma brucei brucei (DiTat 1.1) was injected into 32 bovids of various breeds, 11 animals being kept as controls. Five animals, Simmental-Ndama F1 crosses, were extremely sensitive. They showed overt symptoms and one died on day 18 of infection despite treatment with a trypanocidal drug. Seven other animals became ill but recovered progressively and cleared the infection. Twenty animals, of breeds generally considered to be trypanosensitive as well as ones from trypanotolerant breeds, did not show symptoms apart from anaemia and cleared the infection. Putative protective antibody, i.e. directed against exposed determinants on the coat variant-specific glycoprotein, was detected by agglutination, complement-mediated lysis and inhibition of infectivity. All animals showed a primary immune response consisting of IgM whose kinetics and amplitude were indistinguishable between animals of differing sensitivity. The response was long-lasting, whether the animals had been treated or not with a trypanocidal drug 3 weeks after infection, and antibody of IgG1 and IgG2 types were detected in certain sensitive as well as resistant animals after 2 months. Some animals were rechallenged with DiTat 1.1 either 1 year after the primary infection or 6 months after inoculation of irradiated trypanosomes. Peak titres of antibody were lower than was the case following primary infection but higher levels of mercaptoenthanol-resistant antibodies were seen. In no case was there any difference in the response of sensitive or tolerant animals. Our results do not support the idea that resistance of certain bovids to African trypanosomiasis is due to a better protective antibody response.

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Selected References

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