Publications

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neurotoxicity in calves induced by the plant, nierembergia hippomanica miers var. violacea millán in south africa.the plant nierembergia hippomanica var. violacea has been incriminated in field outbreaks of neurotoxicity in calves in the free state province. hepatotoxicity and electrocardiogram (ecg) deviations were induced in a sheep dosed with 5 g/kg dried plant material on four consecutive days. a calf dosed with 2.5 g/kg dried plant material, on two consecutive days, did not show overt clinical changes. voluntary ingestion of approximately 30 g/kg fresh flowering plants by a second calf resulted in nerv ...199910631710
prevalence of theileria equi and babesia caballi infections in horses belonging to resource-poor farmers in the north-eastern free state province, south africa.the prevalence of theileria equi and babesia caballi infections in the north-eastern free state province of south africa was determined by examination of thin and thick giemsa-stained blood smears, ifat and pcr. no parasites were detected by microscopy from any blood samples collected at five study sites, qwaqwa, kestell, harrismith, vrede and warden. of the tested serum samples, 28/29 (96.5%), 20/21 (95.2%) and 42/42 (100%) were positive by ifat for t. equi infections in harrismith, kestell and ...200818788207
a comparison of the vector competence of the biting midges, culicoides (avaritia) bolitinos and c. (a.) imicola, for the bryanston serotype of equine encephalosis virus.equine encephalosis virus (eev) is widespread and prevalent in southern africa. in this study, the oral susceptibility of culicoides (avaritia) imicola kieffer (diptera: ceratopogonidae) to eev was confirmed. in addition, c. (a.) bolitinos meiswinkel, collected in the high-lying eastern free state, south africa, was systemically infected with the bryanston serotype of eev after feeding through a membrane on artificially infected equine blood containing 4.7 log10 pfu/ml of eev. the mean infectivi ...200212510889
the virtual absence of culicoides imicola (diptera: ceratopogonidae) in a light-trap survey of the colder, high-lying area of the eastern orange free state, south africa, and implications for the transmission of arboviruses.altogether 52 078 culicoides biting midges of 35 species were collected during february 1990 and 1993 in 40 light-trap collections made on 17 cattle and/or sheep farms in the bethlehem and fouriesburg districts of the colder, high-lying eastern orange free state. culicoides (avaritia) bolitinos was by far the most abundant species, representing 50.9% of all specimens collected. culicoides (a.) imicola, considered to be the most common stock-associated species in the summer rainfall areas of sout ...19947501364
descriptive study of an outbreak of equine sarcoid in a population of cape mountain zebra (equus zebra zebra) in the gariep nature reserve.an outbreak of equine sarcoid occurred in a population of cape mountain zebra (equus zebra zebra) at the gariep nature reserve located in the southern free state province of south africa in 1996. the course of the outbreak during 1996 to 2003 is described. during this period the average population size was 69 animals. initially (1996) all affected animals were removed from the population. new cases continued to manifest and the incidence varied between 4.6% and 17.6%. prevalence reached 24.7% in ...200617458342
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