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The Onderstepoort Journal of Veterinary Research|December 1, 1984
Colostrum-derived antibodies to Cowdria ruminantium in the serum of calves and lambsJ L Du PlessisThe Onderstepoort Journal of Veterinary Research|September 1, 1981
The influence of dithiosemicarbazone on the immunity of sheep to heartwaterJ L Du PlessisThe Onderstepoort Journal of Veterinary Research|June 1, 1985
A method for determining the Cowdria ruminantium infection rate of Amblyomma hebraeum: effects in mice injected with tick homogenatesJ L Du PlessisThe Onderstepoort Journal of Veterinary Research|March 1, 1993
An in vitro test to demonstrate the inhibitory effect of homologous immune serum on the infectivity of Cowdria ruminantiumJ L Du PlessisRevue D'Elevage Et De Medecine Veterinaire Des Pays Tropicaux|January 1, 1993
The relationship between Cowdria and Ehrlichia: change in the behaviour of ehrlichial agents passaged through Amblyomma hebraeumJ L Du PlessisThe Onderstepoort Journal of Veterinary Research|December 1, 1990
Increased pathogenicity of an Ehrlichia-like agent after passage through Amblyomma hebraeum: a preliminary reportJ L du PlessisThe Onderstepoort Journal of Veterinary Research|November 24, 1999
Electron microscopy of Cowdria-infected macrophages suggests that in the absence of binary fission a mosaic of organisms develops from an amorphous electron dense matrixJ L Du PlessisThe Onderstepoort Journal of Veterinary Research|December 1, 1985
The natural resistance of cattle to artificial infection with Cowdria ruminantium: the role played by conglutininJ L Du PlessisThe Onderstepoort Journal of Veterinary Research|September 1, 1987
Problems with the interpretation of epidemiological data in heartwater: a study on 23 farmsJ L Du Plessis, L MalanThe Onderstepoort Journal of Veterinary Research|December 1, 1988
Susceptibility to heartwater of calves born to non-immune cowsJ L Du Plessis, L MalanPageof 5