African horse sickness,
South Africa
Information received on 08/05/2006 from Dr Bothle Michael Modisane, Chief Director , Department of Agriculture, Forestry and Fisheries, Animal Production and Health, PRETORIA, South Africa
Summary
Report type Immediate notification
Date of start of the event 14/03/2006
Date of confirmation of the event 27/03/2006
Report date 08/05/2006
Date submitted to OIE 08/05/2006
Date event resolved 28/06/2006
Reason for notification Recurrence of a listed disease
Date of previous occurrence 2004
Manifestation of disease Clinical disease
Causal agent African horse sickness virus (family: Reoviridae; genus: Orbivirus)
Nature of diagnosis Clinical, Laboratory (advanced), Necropsy
This event pertains to a defined zone within the country
Related reports Immediate notification (08/05/2006)
Follow-up report No. 1 (03/01/2008)
New outbreaks (3)
Outbreak 1 Dageraad, Worcester, Western Cape Province
Date of start of the outbreak 27/03/2006
Outbreak status Resolved (28/06/2006)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Equidae 53 11 4 2 0
Outbreak 2 Rondeheuwel, Worcester, Western Cape Province
Date of start of the outbreak 27/03/2006
Outbreak status Resolved (28/06/2006)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Equidae 10 2 0 0 0
Outbreak 3 Highlands, Worcester, Western Cape Province
Date of start of the outbreak 28/04/2006
Outbreak status Resolved (28/06/2006)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Equidae 316 1 1 0 0
Summary of outbreaks Total outbreaks: 3
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Equidae 379 14 5 2 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Equidae 3.69% 1.32% 35.71% 1.85%
*Removed from the susceptible population through death, destruction and/or slaughter
Epidemiology
Source of the outbreak(s) or origin of infection
  • Vectors
Epidemiological comments The outbreaks occurred in the protection zone of the African Horse Sickness (AHS) Controlled Area of the Western Cape Province recognised by the European Union, as laid down in council decision 97/10.
Control measures
Measures applied
  • Movement control inside the country
  • Vaccination in response to the outbreak (s)
    Administrative division Species Total Vaccinated Details
    Western Cape Province Equidae 194
  • Dipping / Spraying for control of vectors or parasites
  • Quarantine
  • No treatment of affected animals
Measures to be applied
  • No other measures
Diagnostic test results
Laboratory name and type Species Test Test date Result
Onderstepoort Vet. Institute, Agricultural Research Council (ARC) (National laboratory) Equidae reverse transcription - polymerase chain reaction (RT-PCR) 03/04/2006 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations