Prevalence of <i>Theileria orientalis</i> types in beef cattle herds on the North Coast of New South Wales

Proctor, Akk; Ball, Michael; Freeman, P.; Jenkins, Cheryl; Bogema, Daniel R.

doi:10.1111/avj.12415

Cited by 8 publications

(5 citation statements)

References 14 publications

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“…In a recent survey of 24 beef herds in the North Coast region of NSW, all herds had at least one animal infected with T. orientalis with a herd-level prevalence of 100%. 6 This prevalence is higher than that previously found in the greater NSW region. 7 The Chitose, Ikeda and Buffeli major piroplasm surface protein (MPSP) types were present in all herds tested without associated clinical disease.…”

Section: Production Animalscontrasting

confidence: 55%

“…An increasing number of disease outbreaks attributable to Theileria orientalis infection has been observed in Australian cattle in recent years, particularly in New South Wales and Victoria. In a recent survey of 24 beef herds in the North Coast region of NSW, all herds had at least one animal infected with T. orientalis with a herd‐level prevalence of 100% . This prevalence is higher than that previously found in the greater NSW region .…”

Section: Production Animalsmentioning

confidence: 80%

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In this issue – April 2016

Cabral¹

2016

Aust Veterinary J

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Section: Production Animalscontrasting

confidence: 55%

Section: Production Animalsmentioning

confidence: 80%

In this issue – April 2016

Cabral¹

2016

Aust Veterinary J

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“…Theileria parva and T. annulata , commonly known as East Coast fever and tropical theileriosis, respectively, are highly pathogenic, whereas T. orientalis is believed to cause mild or asymptomatic disease [ 2 ]. However, recently, T. orientalis has emerged as an agent capable of causing outbreaks of clinical theileriosis resulting in losses to the Asia–Pacific cattle industry [ 3 , 4 ].…”

Section: Resultsmentioning

confidence: 99%

Pathogenic genotype of major piroplasm surface protein associated with anemia in Theileria orientalis infection in cattle

Kim

Chae

et al. 2017

Acta Vet Scand

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Serious disease outbreaks in cattle caused by Theileria orientalis have emerged in the Asia–Pacific region. Genetic variables of the major piroplasm surface protein (MPSP) expressed on the surface of the piroplasm inside T. orientalis-infected erythrocytes are considered to be associated with variation in the pathogenicity of T. orientalis. Our study describes the clinically relevant MPSP types associated with anemia in Theileria-infected cattle. These results revealed that MPSP expression plays an important role in hematological alterations in Theileria-infected cattle, and that MPSP type 1 is strongly associated with bovine anemia, which can be a potential target for the prevention of bovine theileriosis.

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“…In a different study in Australia, an analysis of clinical case records of T. orientalis infections from the Northern Tablelands and North Coast regions since 2009 revealed that co-infections with both pathogenic and non-pathogenic genotypes were most common [27]. Overall, the high herd and animal prevalence of infection with T. orientalis in healthy cattle suggests the need for caution in using Theileria-positive PCR results to arrive at a definitive diagnosis of clinical disease [42]. While the level of parasitemia determined by qPCR has been shown to have diagnostic value [43], this appears to have most diagnostic value at a herd rather than individual animal level [27].…”

Section: Host Factorsmentioning

confidence: 99%

Epidemiology and Transmission of Theileria orientalis in Australasia

Lakew,

Eastwood,

Walkden-Brown

2023

Pathogens

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Oriental theileriosis, a disease primarily impacting cattle is caused by an apicomplexan hemoprotozoan parasite, Theileria orientalis. It has now become established in the Australasia region. The organism was long considered a benign cause of persistent infections; however, an increase in clinical outbreaks since 2006 in the eastern Australian states and New Zealand was associated with the identification of the pathogenic Ikeda (Type 2) and Chitose (Type 1) genotypes. Unlike the pathogenic T. parva and T. annulate, which target leucocytes, clinical manifestation with T. orientalis is due to its effects on erythrocytes, with the infection sometimes designated as Theileria associated bovine anemia (TABA). In Australia and New Zealand, the tick Haemaphysalis longicornis is the principal vector, though other Haemaphysalis species are also likely vectors. The endemic status of infection with pathogenic genotypes in areas with low or absent tick populations is an apparent paradox that may be attributable to alternative modes of transmission, such as mechanical transmission by hematophagous insects (lice, mosquitoes, and biting flies), vertical transmission, and transmission via iatrogenic means. This review addresses the evidence for the different modes of transmission of T. orientalis with particular focus on the reported and potential vectors in Australasia.

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Prevalence of Theileria orientalis types in beef cattle herds on the North Coast of New South Wales

Abstract: The results indicate endemicity of T. orientalis, especially the Ikeda type, in the NCLHPA region of Australia.

Cited by 8 publications

References 14 publications

In this issue – April 2016

In this issue – April 2016

Pathogenic genotype of major piroplasm surface protein associated with anemia in Theileria orientalis infection in cattle

Epidemiology and Transmission of Theileria orientalis in Australasia

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