African horse sickness,
Information received on 08/05/2020 from Dr Sorravis Thaneto, Director General, Livestock Development, Ministry of Agriculture and Cooperatives, BANGKOK, Thailand
Report type Follow-up report No. 6
Date of start of the event 24/02/2020
Date of confirmation of the event 27/03/2020
Report date 08/05/2020
Date submitted to OIE 08/05/2020
Reason for notification First occurrence of a listed disease in the country
Causal agent African horse sickness virus
Serotype 1
Nature of diagnosis Clinical, Laboratory (advanced)
This event pertains to a defined zone within the country
Related reports Immediate notification (27/03/2020)
Follow-up report No. 1 (03/04/2020)
Follow-up report No. 2 (10/04/2020)
Follow-up report No. 3 (17/04/2020)
Follow-up report No. 4 (24/04/2020)
Follow-up report No. 5 (01/05/2020)
Follow-up report No. 6 (08/05/2020)
Follow-up report No. 7 (15/05/2020)
Follow-up report No. 8 (22/05/2020)
Follow-up report No. 9 (29/05/2020)
Follow-up report No. 10 (05/06/2020)
Follow-up report No. 11 (12/06/2020)
Follow-up report No. 12 (19/06/2020)
Follow-up report No. 13 (26/06/2020)
Follow-up report No. 14 (03/07/2020)
Follow-up report No. 15 (10/07/2020)
Follow-up report No. 16 (17/07/2020)
Follow-up report No. 17 (24/07/2020)
Follow-up report No. 18 (31/07/2020)
Outbreaks There are no new outbreaks in this report
Source of the outbreak(s) or origin of infection
  • Unknown or inconclusive
Epidemiological comments Four samples (equine blood and serum) were sent to the Pirbright Institute (United Kingdom) for checking serotype on the 31st March 2020 and the results were positive for African Horse Sickness (AHS) disease and all four samples were diagnosed as serotype 1 of AHS virus. Those samples were sent by a private veterinarian. However, the Department of Livestock Development (DLD, competent authority of veterinary service in Thailand) will send more samples from other outbreak spots to check the serotype in two or more OIE Reference Laboratories for AHS soon. The Department of Livestock Development started vaccination against African Horse Sickness (Polyvalent live attenuated vaccine) on April 19, 2020. Horses within the Horse and Animal Breeding Station, Thai Red Cross Society, Cha-am District, Phetchaburi Province, supplying 560 horses used to produce immunoglobulins to treat rabies and snake venom, were the first one to be vaccinated with AHS vaccine in Thailand. The further AHS vaccination started from April 20, 2020 which will be conducted for horses at a distance of 50 kilometers from the disease sites in 7 provinces where an outbreak was discovered. The AHS working group conducted a preparatory meeting with targeted Regional, Provincial, and District Livestock offices and related parties before the vaccination. The meeting emphasized on the operation for effective vaccination to struggle against the AHS epidemic as quickly as possible.
Control measures
Measures applied
  • Movement control inside the country
  • Vaccination in response to the outbreak (s)
    Administrative division Species Total Vaccinated Details
    Chon Buri Equidae 254
    Kanchanaburi Equidae 20
    Krung Thep Maha Nakhon (Bangkok) Equidae 315
    Nakhon Ratchasima Equidae 838
    Phetchaburi Equidae 739
    Prachin Buri Equidae 7
    Prachuap Khiri Khan Equidae 383
    Ratchaburi Equidae 356
    Sa Kaeo Equidae 93
    Saraburi Equidae 396
  • Surveillance outside containment and/or protection zone
  • Surveillance within containment and/or protection zone
  • Quarantine
  • Zoning
  • Disinfection
  • Control of vectors
  • Vector surveillance
  • No treatment of affected animals
Measures to be applied
  • No other measures
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.