Equine piroplasmosis,
New Zealand
Information received on 22/05/2020 from Dr Tony Zohrab, , Policy and Trade Branch, Ministry for Primary Industries, Wellington , New Zealand
Summary
Report type Immediate notification
Date of start of the event 22/04/2020
Date of confirmation of the event 22/05/2020
Report date 22/05/2020
Date submitted to OIE 22/05/2020
Reason for notification First occurrence of a listed disease
Manifestation of disease Sub-clinical infection
Causal agent Theileria equi
Nature of diagnosis Laboratory (basic), Laboratory (advanced)
This event pertains to the whole country
Related reports Immediate notification (22/05/2020)
Follow-up report No. 1 (29/05/2020)
New outbreaks (1)
Outbreak 1 Karaka, Karaka, Auckland, Auckland
Date of start of the outbreak 22/04/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Equidae 140 1 0 0 0
Affected population A four-year-old mare.
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Equidae 140 1 0 0 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Equidae 0.71% 0.00% 0.00% 0.00%
*Removed from the susceptible population through death, destruction and/or slaughter
Epidemiology
Source of the outbreak(s) or origin of infection
  • Unknown or inconclusive
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.
Control measures
Measures applied
  • Traceability
  • Vaccination permitted (if a vaccine exists)
  • No treatment of affected animals
Measures to be applied
  • No other measures
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
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations