Associations between <i>Theileria orientalis</i> Ikeda type infection and the growth rates and haematocrit of suckled beef calves in the North Island of New Zealand

Lawrence, K.E.; Lawrence, B L; Hewitt, C A; Gedye, Kristene; Fermin, Lisanne M; Pomroy, W.E.

doi:10.1080/00480169.2018.1547227

Cited by 19 publications

(19 citation statements)

References 21 publications

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“…In countries in which T. orientalis Ikeda is established, the parasite contributes to economic losses through chronically ill animals. During 2010 in Australia, losses caused by T. orientalis Ikeda were estimated to be Aus ≈$20 million ( 5 , 10 ). In New Zealand, the cost of 1 outbreak on a large dairy farm was estimated to be ≈1 million New Zealand dollars ( 5 ).…”

Section: Discussionmentioning

confidence: 99%

“…In Asia, New Zealand, and Australia, theileriosis caused by T. orientalis is an economically serious disease manifested primarily by loss of revenue from deaths or illness in beef and dairy cattle ( 1 , 8 – 10 ). Of increasing concern is the Ikeda genotype of T. orientalis , which has been implicated as the etiologic agent of infectious bovine anemia ( 11 , 12 ).…”

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confidence: 99%

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Theileria orientalis Ikeda Genotype in Cattle, Virginia, USA

Oakes¹,

Yabsley²,

Schwartz³

et al. 2019

Emerg. Infect. Dis.

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Theileria orientalis Ikeda genotype is a parasite that causes a disease in cattle that results in major economic issues in Asia, New Zealand, and Australia. The parasite is transmitted by Haemaphysalis longicornis ticks, which have recently been reported in numerous states throughout the eastern United States. Concurrently, cattle in Virginia showed clinical signs consistent with a hemoprotozoan infection. We used amplicons specific for the major piroplasm surface protein and small subunit rDNA of piroplasms to test blood samples from the cattle by PCR. Bidirectional Sanger sequencing showed sequences with 100% identity with T. orientalis Ikeda genotype 2 sequences. We detected the parasite in 3 unrelated herds and from various animals sampled at 2 time points. Although other benign T. orientalis genotypes are endemic to the United States, detection of T. orientalis Ikeda genotype might represent a risk for the cattle industry in Virginia.

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

Theileria orientalis Ikeda Genotype in Cattle, Virginia, USA

Oakes¹,

Yabsley²,

Schwartz³

et al. 2019

Emerg. Infect. Dis.

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“…Recently, Theileria orientalis Ikeda, a protozoan parasite transmitted by H. longicornis in East Asia, New Zealand, and Australia, has been detected in cattle in Virginia, and this has prompted further concerns that this tick species might play a role in the continued transmission of the pathogen causing Theileria-associated bovine infectious anemia [17]. In Australia, it is estimated that T. orientalis infection has been associated with a loss of AUD 19.6 million per annum for the red meat industry [51]. Therefore, the potential role of this tick in transmitting these pathogens in humans and animals in North America cannot be ignored.…”

Section: Discussionmentioning

confidence: 99%

Comparison of Habitat Suitability Models for Haemaphysalis longicornis Neumann in North America to Determine Its Potential Geographic Range

Namgyal

Couloigner

Lysyk

et al. 2020

IJERPH

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Haemaphysalis longicornis Neumann, 1901 is a vector of many pathogens of public and veterinary health importance in its native range in East Asia and introduced range in Oceania. In North America, this tick was first detected in New Jersey in 2017. Currently, this tick has been reported from 15 states of the United States. In this study, we modeled the habitat suitability of H. longicornis using the MaxEnt modeling approach. We separated occurrence records from the published literature from four different geographical regions in the world and developed MaxEnt models using relevant environmental variables to describe the potential habitat suitability of this tick in North America. The predictive accuracy of the models was assessed using the U.S. county locations where this tick species has been reported. Our best model predicted that the most suitable North American areas for geographic expansion of H. longicornis are from Arkansas–South Carolina to the south of Quebec–Nova Scotia in the east, and from California to the coast of British Columbia in the west. Enhanced surveillance and further investigation are required to gain a better understanding of the role that this tick might play in the transmission of diseases to humans and animals in North America.

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“…T. orientalis Ikeda was rst identi ed in Australia in 2011 [15], and by 2014, outbreaks of the disease had affected approximately 25% of Australian cattle [16,17]. It is estimated that the indirect costs of T. orientalis Ikeda to the Australian beef industry, comprised of reduced meat and milk yields [16,18], is $19.6 million per year [19]. A similar, sudden emergence of the T. orientalis Ikeda genotype occurred in New Zealand beginning in 2012 [20], with periparturient and lactating dairy cows and young calves exhibiting the highest morbidity and mortality [20].…”

Section: Introductionmentioning

confidence: 99%

A U.S. Isolate of Theileria Orientalis, Ikeda Genotype, is Transmitted to Cattle by the Invasive Asian Longhorned Tick, Haemaphysalis Longicornis

Dinkel

Herndon

Noh

et al. 2020

Preprint

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BACKGROUNDTheileria orientalis is a tick-borne hemoparasite that causes anemia, ill thrift, and death in cattle globally. The Ikeda strain of T. orientalis is more virulent than other strains, leading to severe clinical signs and death in less than 5% of affected animals. Within the Asia-Pacific region, where it affects 25% of Australian cattle, T. orientalis Ikeda has a significant economic impact on the cattle industry. In 2017, T. orientalis Ikeda was detected in a cattle herd in Albermarle County, Virginia, United States. Months earlier, the U.S. was alerted to the invasion of the Asian longhorned tick, Haemaphysalis longicornis, throughout the eastern U.S. Abundant H. longicornis ticks were identified on cattle in the T. orientalis-affected herd in VA, and a subset of ticks from the environment were PCR-positive for T. orientalis Ikeda. A strain of T. orientalis from a previous U.S. outbreak was not transmissible by H. longicornis; however, H. longicornis is the primary tick vector of T. orientalis Ikeda in other regions of the world. Thus, the objective of this study was to determine whether invasive H. longicornis ticks in the U.S. are competent vectors of T. orientalis Ikeda. METHODSNymphal H. longicornis ticks were fed on a splenectomized calf infected with the VA-U.S.-T. orientalis Ikeda strain. After molting, a subset of adult ticks from this cohort were dissected, and salivary glands assayed for T. orientalis Ikeda via qPCR. The remaining adult ticks from the group were allowed to feed on three calves. Calves were subsequently monitored for T. orientalis Ikeda infection via blood smear cytology and PCR.RESULTSAfter acquisition feeding on a VA-U.S.-T. orientalis Ikeda-infected calf as nymphs, a subset of molted adult tick salivary glands tested positive by qPCR for T. orientalis Ikeda. Adult ticks from the same cohort successfully transmitted T. orientalis Ikeda to 3/3 naïve calves, each of which developed parasitemia reaching 0.4-0.9%.CONCLUSIONSOur findings demonstrate that U.S. H. longicornis ticks are competent vectors of the VA-U.S.-T. orientalis Ikeda strain. This data provides important information for the U.S. cattle industry regarding the potential spread of this parasite and the necessity of enhanced surveillance and control measures.

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Associations between Theileria orientalis Ikeda type infection and the growth rates and haematocrit of suckled beef calves in the North Island of New Zealand

Cited by 19 publications

References 21 publications

Theileria orientalis Ikeda Genotype in Cattle, Virginia, USA

Theileria orientalis Ikeda Genotype in Cattle, Virginia, USA

Comparison of Habitat Suitability Models for Haemaphysalis longicornis Neumann in North America to Determine Its Potential Geographic Range

A U.S. Isolate of Theileria Orientalis, Ikeda Genotype, is Transmitted to Cattle by the Invasive Asian Longhorned Tick, Haemaphysalis Longicornis

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