|Source of the outbreak(s) or origin of infection
||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.
The Department of Livestock Development has brainstormed experts in veterinary epidemiology to join a meeting, which the meeting has set the action plan on surveillance, prevention and control of African horse sickness in Thailand which is divided into 3 phases. The first phase is the plan to encounter the disease which the plan duration schedules between April to October 2020. The second phase is the plan to conduct the disease surveillance and prevention of the recurrence which is scheduled between November 2020 to November 2022. The third phase is the plan to recover the AHS free status recognised by the OIE which is scheduled between 2022 to 2023. The 3-phrases action plan was approved by a subcommittee on surveillance, prevention and control of African horse sickness in Thailand.
There are 3 provinces where Africa Horse Sickness disease is resolved, including Chaiyaphum, Sa Kaeo and Ratchaburi.