Browsing 1989 Onderstepoort Journal of Veterinary Research, Volume 56, 1989 by Author "Van Gas, L."

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The heterogenicity of Cowdria ruminantium stocks : cross-immunity and serology in sheep and pathogenicity to mice

Du Plessis, J.L.; Van Gas, L.; Olivier, J.A.; Bezuidenhout, J. Dürr; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1989)

Ten stocks of Cowdria ruminantium (Ball 3, Breed, Comoro, Germishuys, Kümm, Kwanyanga, Mali, Mara, Nonile and Welgevonden) were compared from a cross-immunity, serological and mouse pathogenicity point of view. They were ...
Immunity of tick-exposed seronegative and seropositive small stock challenged with two stocks of Cowdria ruminantium

Du Plessis, J.L.; Van Gas, L.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1989)

Nineteen per cent and 32 % of serologically positive sheep and goats in heartwater endemic areas of the Republic of South Africa were susceptible to challenge with, respectively, the Ball 3 and Welgevonden stocks of Cowdria ...

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