Theileria orientalis Ikeda genotype infection associated with anaemia, abortion and death in beef cattle in Western Australia

Australian Veterinary Journal
D ForshawS Hair

Abstract

Theileria orientalis infection causes a clinical syndrome in cattle characterised by weakness, reluctance to walk, anaemia, jaundice and death in peri-parturient cows and young calves, referred to as bovine anaemia caused by Theileria orientalis group (BATOG). Abortions in pregnant cows are also reported. Pallor, pyrexia and elevated heart and respiratory rates are typical findings on physical examination. A syndrome of abortions, lethargy, inappetence, jaundice and deaths in beef cattle on two separate properties and a separate cluster of three properties within 15 km west of the town of Denmark in Western Australia was associated with the presence of severe regenerative anaemia and the presence of Theileria orientalis Ikeda genotype in blood samples taken from affected cattle and their cohorts. A diagnosis of bovine anaemia caused by the T. orientalis group was based on consistent clinical, haematological, biochemical and PCR findings. Conventional PCR testing detected only the T. orientalis Ikeda type. On the two properties where it was investigated, quantitative PCR testing for parasite load was suggestive of recent infections. Sequencing of T. orientalis major piroplasm surface protein gene PCR products demonstrated that t...Continue Reading

References

Jun 1, 1985·Australian Veterinary Journal·R B Besier, R Wroth
Feb 13, 2010·Australian Veterinary Journal·M M IzzoJ K House
Sep 13, 2011·Infection, Genetics and Evolution : Journal of Molecular Epidemiology and Evolutionary Genetics in Infectious Diseases·M Khyrul IslamRobin B Gasser
Mar 22, 2015·Infection, Genetics and Evolution : Journal of Molecular Epidemiology and Evolutionary Genetics in Infectious Diseases·C JenkinsD R Bogema
Apr 19, 2015·Parasites & Vectors·Jade Frederick HammerCheryl Jenkins
Jul 7, 2015·New Zealand Veterinary Journal·J G WattsK L Hickey

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