title: An attempt to improve the immunization of sheep against heart-water by using different combinations of 3 stocks of Cowdria ruminantium.
abstract: Neither sheep immune to the Ball 3, the Kwanyanga or the Mara stocks of Cowdria ruminantium nor those immunized with combinations of these 3 stocks were protected against challenge with the Mali stock. Against challenge with the Welgevonden stock, however, immunization with each of the 3 combinations and with single stocks effected a protective immunity.
authors.affiliation: Veterinary Research Institute, Onderstepoort.
authors.forename: J L
authors.initials: JL
authors.lastname: du Plessis
authors.forename: F T
authors.initials: FT
authors.lastname: Potgieter
authors.forename: L
authors.initials: L
authors.lastname: van Gas
mesh_terms: D000818:Animals; D001428:Bacterial Vaccines / Q000276:immunology*; D003429:Cross Reactions / Q000276:immunology; D006357:Heartwater Disease / Q000276:immunology / Q000517:prevention & control*; D012287:Rickettsiaceae / Q000276:immunology*; D012756:Sheep; D012757:Sheep Diseases / Q000276:immunology / Q000517:prevention & control*; D014611:Vaccination / Q000662:veterinary
chemical_list: D001428:Bacterial Vaccines