Laboratory and field investigations into the Theileria parva carrier-state in cattle in Zimbabwe

Show simple item record Hove, T. Kanhai, G.K. Masaka, S.
dc.contributor.editor Boomker, Jacob Diederik Frederik
dc.contributor.upauthor Latif, Abdalla A. 2012-05-28T08:20:00Z 2012-05-28T08:20:00Z 2012 2001
dc.description The articles have been scanned in colour with a HP Scanjet 5590; 600dpi. Adobe Acrobat v.9 was used to OCR the text and also for the merging and conversion to the final presentation PDF-format. en
dc.description.abstract The Theileria parva carrier-state in cattle on commercial farms on Zimbabwe was investigated using parasitological and serological methods. The proportion of cattle showing Theileria piroplasms on two farms, which had recent histories of disease outbreaks, were 64% ( n=106, total of heifers and weaned calves examined) and 71.5% ( n=60) while the proportion of T. parva antibodies for the same animals were 59% and 98.5%, respectively. On four farms where no cases of the disease occurred for over 10 years, the average proportion of animals showing piroplasms and antibodies were 55.4% (range 32-82, n=223) and 73% (range 47-91, n=223), respectively. However, on another three farms which had no history of theileriosis outbreaks these proportions were very low, being 11.4% (0-24, n=157) for piroplasms and 12.2% (5-23, n=157) for antibodies. The mean infection rate in unfed Rhipicephalus appendiculatus adults collected from farms with a high prevalence of cattle which were carriers of Theileria piroplasms during the tick activity season was 29% (range 12-60%) with 9.3 (range 2-18.7) mean infected acini per infected tick. The infectivity of different tick batches to susceptible cattle produced a wide spectrum of theileriosis reactions. Laboratory controlled experiments were carried out to study the persistence of T. parva (Boleni) piroplasms in cattle immunized with this strain as well as its infectivity for ticks and its subsequent transmissibility to cattle. Examination of the salivary glands of 15 batches of ticks collected from six immunized cattle on three different occasions over 18 months showed that none were infected with Theileria parasites. However, the infectivity of other ticks in the same batches to susceptible animals was demonstrated 6, 10 and 18 months after cattle had been immunized with Boleni stabilate. en
dc.description.librarian mn2012 en
dc.description.sponsorship Food and Agriculture Organization (FAO). DANIDA. Government of Zimbabwe. en
dc.identifier.citation Latif, AA, Hove, T, Kanhai, GK & Masaka, S 2001, 'Laboratory and field investigations into the Theileria parva carrier-state in cattle in Zimbabwe’. Onderstepoort Journal of Veterinary Research, vol. 68, no. 3, pp. 203-208. en
dc.identifier.issn 0030-2465
dc.language en
dc.publisher Published jointly by the Agricultural Research Council, ARC-Onderstepoort Veterinary Institute and the Faculty of Veterinary Science, University of Pretoria. en
dc.rights © ARC-Onderstepoort and Faculty of Veterinary Science, University of Pretoria (original). © University of Pretoria. Dept of Library Services (digital). en
dc.subject Veterinary medicine en
dc.subject Carrier-state en
dc.subject Cattle en
dc.subject Epidemiology en
dc.subject Theileria parva en
dc.subject.lcsh Veterinary medicine -- South Africa
dc.subject.lcsh Theileria parva -- Zimbabwe en
dc.subject.lcsh Cattle -- Diseases -- Research en
dc.title Laboratory and field investigations into the Theileria parva carrier-state in cattle in Zimbabwe en
dc.type Article en

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