Studies on the relationship between Besnoitia of blue wildebeest and impala, and Besnoitia besnoiti of cattle

Show simple item record Basson, P.A. McCully, R.M. Van Niekerk, J.W. Bigalke, R.D.
dc.contributor.editor Jansen, B.C. 2016-07-06T12:23:57Z 2016-07-06T12:23:57Z 2016 1967
dc.description The journals have been scanned in colour with a HP 5590 scanner; 600 dpi. Adobe Acrobat v.11 was used to OCR the text and also for the merging and conversion to the final presentation PDF-format. en_ZA
dc.description.abstract The relationship of Besnoitia encountered in blue wildebeest and impala to B. besnoiti of cattle was investigated by studying the susceptibility of rabbits, cattle and sheep to infection with antelope strains, and their subsequent immunity to a challenge with bovine strains. Rabbits were susceptible to infection and a strain from blue wildebeest has been maintained through 27 serial passages by subinoculation of blood during the reactions. Reactions were considerably different from those that have been experienced with bovine strains. The typical skin lesions did not develop; it was much more difficult to find proliferative forms microscopically in blood smears, even in fatal cases but they were plentiful in internal organs of the latter. No cysts were found in the skin or other tissues. Initially the reactions were very mild, but the strain appeared to adapt itself to the new host and eventually became highly pathogenic. Cattle were also susceptible to infection with antelope strains, but developed mild reactions. Some showed a febrile response, whereas in others immunity to challenge was the only indication of infect ion. Proliferative organisms were seen in blood smears of only one of the eight animals infected and no cysts could be found in any of them. Sheep were infected with a strain from blue wildebeest. They developed fairly severe reactions from which all recovered. No proliferative organisms were seen in blood smears, but small numbers of cysts were found in the peripheral veins and nasal mucosa. In spite of the abovementioned distinctiveness in biological behaviour, infection with these strains from antelopes conveyed an immunity to challenge with bovine strains in the three host-species used. This indicates a close immunogenic, and hence taxonomic relationship between the three strains. It is therefore suggested that the parasites of blue wildebeest, impala and cattle be regarded as distinct strains or biological races of B. besnoiti. en_ZA
dc.identifier.citation Bigalke, RD, van Niekerk, JW, Basson, PA & McCully, RM 1967, 'Studies on the relationship between Besnoitia of blue wildebeest and impala, and Besnoitia besnoiti of cattle’, The Onderstepoort journal of veterinary research, vol. 34, no. 1, pp. 7-28. en_ZA
dc.identifier.issn 0330-2465
dc.language.iso en en_ZA
dc.publisher Pretoria : The Government Printer en_ZA
dc.rights © 1967 ARC - Onderstepoort and Faculty of Veterinary Science, University of Pretoria (original). © 2016 University of Pretoria. Dept. of Library Services (digital). en_ZA
dc.subject Veterinary medicine en_ZA
dc.subject.lcsh Veterinary medicine -- South Africa
dc.subject.lcsh Cattle -- Diseases en_ZA
dc.title Studies on the relationship between Besnoitia of blue wildebeest and impala, and Besnoitia besnoiti of cattle en_ZA
dc.type Article en_ZA

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