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T cells bearing the gamma delta antigen receptor (gamma delta T cells) can constitute up to 50 percent of T cells in the peripheral blood and lymphoid organs of young cattle. We present data showing that gamma delta T cells are involved in immune responses against Theileria parva. Gamma delta T c...


Daubenberger, C.A.Taracha, E.L.N.Gaidulis, L.Davis, W.C.McKeever, Declan J.[Bovine gamma delta T cell responses to the intracellular protozoan parasite Theileria parva]Bovine gamma delta T cell responses to the intracellular protozoan parasite Theileria parva

To evaluate vaccinia virus as a delivery system for recombinant antigen in cattle, calves were immunized with a recombinant vaccinia virus (rVV) expressing the sporozoite surface antigen (p67) of Theileria parva (V-67) combined with those expressing bovine IL-4 (V-IL4) or IL-2 (V-IL2). The anti-p...


Honda, Y.Waithaka, M.M.Taracha, E.L.N.Duchateau, L.Musoke, A.J.McKeever, Declan J.[Delivery of the Theileria parva p67 antigen to cattle using recombinant vaccinia virus: IL-2 enhances protection]Delivery of the Theileria parva p67 antigen to cattle using recombinant vaccinia virus: IL-2 enhances protection

There is growing evidence that immunity of cattle to Cowdria ruminantium infection is mediated by T lymphocytes. C. ruminantium antigens that stimulate these responses are therefore of considerable importance to the development of a sub-unit vaccine against the disease. We have examined T cell re...


Mwangi, D.M.McKeever, Declan J.Nyanjui, J.K.Barbet, A.F.Mahan, S.M.[Immunisation of cattle against heartwater by infection with Cowdria ruminantium elicits T lymphocytes that recognise major antigenic proteins 1 and 2 of the agent]Immunisation of cattle against heartwater by infection with Cowdria ruminantium elicits T lymphocytes that recognise major antigenic proteins 1 and 2 of the agent

Theileria parva is the causal agent of East Coast fever (ECF), a fatal disease of cattle characterized by pyrexia, transient lymphadenopathy and panleukopenia. We have evaluated monoclonal antibodies (mAb) against three distinct antigens (p67, PIM and p32) of the parasite as immunohistological re...


Honda, Y.Matsubara, Y.Morzaria, S.P.McKeever, Declan J.[Immunohistochemical detection of parasite antigens in Theileria parva-infected bovine lymphocytes]Immunohistochemical detection of parasite antigens in Theileria parva-infected bovine lymphocytes

Understanding the basis of protective immunity to Cowdria ruminantium will facilitate the development of an effective subunit vaccine against heartwater in ruminants and contribute to a better definition of protective immune mechanisms to obligate intracellular pathogens in general. Until recentl...


Totte, P.Bensaid, A.Mahan, S.M.Martínez, D.McKeever, Declan J.[Immune responses to Cowdria ruminantium infections]Immune responses to Cowdria ruminantium infections

We describe a highly sensitive, non-radioactive assay for T cell activation, based on the rapid induction of class II MHC expression by constitutively negative bovine endothelial cells, when cultured in the presence of supernatants derived from activated bovine T cells. We demonstrate the effecti...


Ballingall, K.T.Mwangi, D.M.MacHugh, Niall D.Taracha, E.L.N.Totte, P.McKeever, Declan J.[A highly sensitive, non-radioactive assay for T cell activation in cattle: Applications in screening for antigens recognised by CD4+ and CD8+ T cells]A highly sensitive, non-radioactive assay for T cell activation in cattle: Applications in screening for antigens recognised by CD4+ and CD8+ T cells

There is strong evidence that class I MHC-restricted parasite-specific CD8+ CTL protect cattle against the protozoan parasite Theileria parva. As part of an effort to develop a subunit vaccine for the induction of these responses, we have investigated the factors involved in the generation of T. ...


Taracha, E.L.N.Awino, EliasMcKeever, Declan J.[Distinct CD4 + T cell helper requirements in Theileria parva-immune and -naive bovine CTL precursors]Distinct CD4 + T cell helper requirements in Theileria parva-immune and -naive bovine CTL precursors

Previous data showed that six out of a group of nine cattle inoculated with NS1-p67, a recombinant form of a 67-KDa Theileria parva sporozoite surface protein, were immune to East Coast fever. This bacterialy expressed antigen encoded all 709 amino acid residues of p67 fused to the C-terminal end...


Nene, VishvanathInumaru, S.McKeever, Declan J.Morzaria, S.P.Shaw, M.Musoke, A.J.[Characterization of an insect cell-derived Theileria parva sporozoite vaccine antigen and immunogenicity in cattle]Characterization of an insect cell-derived Theileria parva sporozoite vaccine antigen and immunogenicity in cattle

Initial laboratory trials of an experimental subunit vaccine against Theileria parva based on the 67-kDa major sporozoite surface antigen revealed a range of responses to challenge. We have analyzed convergence in seven sets of monozygotic twins which suggests that genetic factors may have an i...


Ballingall, K.T.Luyai, A.Rowlands, G.J.Sales, J.Musoke, A.J.Morzaria, S.P.McKeever, Declan J.[Bovine leukocyte antigen major histocompatibility complex class II DRB3*2703 and DRB3*1501 alleles are associated with variation in levels of protection against Theileria parva challenge following immunization with the sporozoite p67 antigen]Bovine leukocyte antigen major histocompatibility complex class II DRB3*2703 and DRB3*1501 alleles are associated with variation in levels of protection against Theileria parva challenge following immunization with the sporozoite p67 antigen

The p67 sporozoite antigen of Theileria parva has been fused to the C-terminal secretion signal of Escherichia coli hemolysin and expressed in secreted form by attenuated Salmonella dublin areA strain SL5631. The recombinant p67 antigen was detected in the supernatant of transformed bacterial cul...


Gentschev, I.Glaser, I.Goebel, W.McKeever, Declan J.Musoke, A.J.Heussler, V.T.[Delivery of the p67 sporozoite antigen of Theileria parva by using recombinant Salmonella dublin: Secretion of the product enhances specific antibody responses in cattle]Delivery of the p67 sporozoite antigen of Theileria parva by using recombinant Salmonella dublin: Secretion of the product enhances specific antibody responses in cattle

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