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Equine piroplasmosis, New Zealand
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Information received on 22/05/2020 from Dr Tony Zohrab, , Policy and Trade Branch,
Ministry for Primary Industries, Wellington , New Zealand
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Summary
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Outbreak 1 |
Karaka, Karaka, Auckland, Auckland |
Date of start of the outbreak |
22/04/2020 |
Outbreak status |
Resolved (29/05/2020) |
Epidemiological unit |
Farm |
Affected animals |
Species |
Susceptible |
Cases |
Deaths |
Killed and disposed of |
Slaughtered |
Equidae |
143 |
1 |
0 |
0 |
0 |
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Affected population |
A four-year-old mare. |
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Summary of outbreaks |
Total outbreaks: 1 |
Total animals affected |
Species |
Susceptible |
Cases |
Deaths |
Killed and disposed of |
Slaughtered |
Equidae |
143 |
1 |
0 |
0 |
0 |
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Outbreak statistics |
Species |
Apparent morbidity rate |
Apparent mortality rate |
Apparent case fatality rate |
Proportion susceptible animals lost* |
Equidae |
0.70% |
0.00% |
0.00% |
0.00% |
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*Removed from the susceptible population through death, destruction and/or slaughter |
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Epidemiology
Source of the outbreak(s) or origin of infection |
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Epidemiological comments |
As part of routine testing for export a four-year-old mare tested positive on antibody ELISA for Theileria equi. The mare was previously imported into New Zealand in February 2019. While the horse met import testing requirements, preliminary investigations suggest that it was infected with T.equi when it was imported. The affected mare is under voluntary movement restrictions.
Transmission of equine piroplasmosis is primarily through a competent tick vector. New Zealand has no confirmed vectors for T.equi. For the period the mare has been resident in New Zealand all contact animals, where it is feasible for iatrogenic transmission (through blood) to occur, are being traced and tested. |
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Control measures
Measures applied |
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Traceability
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Vaccination permitted (if a vaccine exists)
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No treatment of affected animals
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Measures to be applied |
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Diagnostic test results
Laboratory name and type |
Species |
Test |
Test date |
Result |
New Zealand National Animal Health Laboratory (National laboratory) |
Equidae |
competitive ELISA (c-ELISA) |
30/04/2020 |
Positive |
New Zealand National Animal Health Laboratory (National laboratory) |
Equidae |
gene sequencing |
22/05/2020 |
Positive |
New Zealand National Animal Health Laboratory (National laboratory) |
Equidae |
indirect fluorescent antibody (IFA) test |
07/05/2020 |
Positive |
New Zealand National Animal Health Laboratory (National laboratory) |
Equidae |
polymerase chain reaction (PCR) |
22/05/2020 |
Positive |
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Future Reporting
The event is continuing. Weekly follow-up reports will be submitted. |
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Map of outbreak locations
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