South Africa - 1 new outbreak of Rift Valley fever in sheep on farm, Letsemeng, Free State (OIE, May 16, 2018)

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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

Summary 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 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

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 Continuing (or date resolved not provided) Epidemiological unit Farm Affected animals Species Susceptible Cases Deaths Killed and disposed of Slaughtered Sheep 600 250 250 0 0

Summary of outbreaks Total outbreaks: 1 Total animals affected Species Susceptible Cases Deaths Killed and disposed of Slaughtered Sheep 600 250 250 0 0 Outbreak statistics Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost* Sheep 41.67% 41.67% 100.00% 41.67% *Removed from the susceptible population through death, destruction and/or slaughter

Epidemiology 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.

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http://www.oie.int/wahis_2/public/wahid.php/Reviewreport/Review?page_refer=MapFullEventReport&reportid=26639