Rift Valley fever,
Information received on 15/10/2020 from Dr Mbargou Lo, Directeur des Services vétérinaires, Direction des Services vétérinaires, Ministère de l'Elevage et des Productions animales, Dakar, Senegal
Report type Immediate notification
Date of start of the event 03/09/2020
Date of confirmation of the event 14/09/2020
Report date 15/10/2020
Date submitted to OIE 15/10/2020
Reason for notification Recurrence of a listed disease
Date of previous occurrence 15/05/2014
Manifestation of disease Clinical disease
Causal agent Rift Valley Fever virus
Nature of diagnosis Clinical, Laboratory (basic), Laboratory (advanced)
This event pertains to a defined zone within the country
Related reports Immediate notification (15/10/2020)
Follow-up report No. 1 (28/10/2020)
New outbreaks (1)
Outbreak 1 Bango, Saint-Louis, Saint-Louis, Saint Louis
Date of start of the outbreak 03/09/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Other
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Roan antelope:Hippotragus equinus(Bovidae) 3 1 1 0 0
Affected population The sick antelope presented clinical signs : hyperthermia (temperature: 39.5 ° C), inappetence and weakness. At its death, the autopsy revealed: - icterus on the mucous membranes of the mouth, eyes, muscles, mesentery and abdominal viscera; - haemorrhage of the viscera; - hypertrophy of the spleen, liver and gall bladder.
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Roan antelope:Hippotragus equinus(Bovidae) 3 1 1 0 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Roan antelope:Hippotragus equinus(Bovidae) 33.33% 33.33% 100.00% 33.33%
*Removed from the susceptible population through death, destruction and/or slaughter
Source of the outbreak(s) or origin of infection
  • Unknown or inconclusive
Epidemiological comments The dead antelope commonly denominated "Hippotragus equinus" lived in a private reserve equipped with steady water points. In addition, it is worth underlining there is heavy rainfall.
Control measures
Measures applied
  • Movement control inside the country
  • Surveillance outside containment and/or protection zone
  • Surveillance within containment and/or protection zone
  • Quarantine
  • Control of wildlife reservoirs
  • Vaccination permitted (if a vaccine exists)
  • No treatment of affected animals
Measures to be applied
  • Vaccination in response to the outbreak (s)
  • Traceability
  • Disinfection
  • Disinfestation
  • Control of vectors
  • Vector surveillance
  • Ante and post-mortem inspections
Diagnostic test results
Laboratory name and type Species Test Test date Result
National Laboratory for Veterinary Research and Livestock (National laboratory) Roan antelope polymerase chain reaction (PCR) 14/09/2020 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations