Rift Valley fever,
South Africa
Information received on 16/05/2018 from Dr Bothle Michael Modisane, Chief Director , Department of Agriculture, Forestry and Fisheries, Animal Production and Health, PRETORIA, South Africa
Report type Immediate notification
Date of start of the event 28/04/2018
Date of confirmation of the event 16/05/2018
Report date 16/05/2018
Date submitted to OIE 16/05/2018
Date event resolved 30/06/2018
Reason for notification Recurrence of a listed disease
Date of previous occurrence 30/08/2011
Manifestation of disease Clinical disease
Causal agent Rift Valley fever virus
Nature of diagnosis Clinical, Laboratory (advanced), Necropsy
This event pertains to a defined zone within the country
Related reports Immediate notification (16/05/2018)
Follow-up report No. 1 (24/08/2018)
New outbreaks (1)
Outbreak 1 (RVF_2018_001) RVF_2018_001, Letsemeng, Free State
Date of start of the outbreak 28/04/2018
Outbreak status Resolved (30/06/2018)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Sheep 600 335 335 0 0
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Sheep 600 335 335 0 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Sheep 55.83% 55.83% 100.00% 55.83%
*Removed from the susceptible population through death, destruction and/or slaughter
Source of the outbreak(s) or origin of infection
  • Vectors
Epidemiological comments Coordinates modified to protect confidentiality as required by South African Legislation.
Control measures
Measures applied
  • Vaccination permitted (if a vaccine exists)
  • No treatment of affected animals
Measures to be applied
  • Vaccination in response to the outbreak (s)
  • Screening
  • Quarantine
Diagnostic test results
Laboratory name and type Species Test Test date Result
IDEXX Laboratories (Private Laboratory) Sheep immunohistochemical test 16/05/2018 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations