Bovine Spongiform Encephalopathy (BSE)
There has been no reported case of BSE in Thailand. In order to be assured of the free status, Thailand has been applying vigorous preventive measures complemented by an ongoing active and passive surveillance program.
For active clinical surveillance, target for neurological disease in cattle with intensive follow-up investigations of cases involving unexplained neurological signs. The case definition for animal suspected for BSE is cattle with the age more than 24 months displaying neurological signs such as changes in temperament (nervousness or aggression), abnormal posture, incoordination and difficulty in rising, decreased milk production, or loss of appetite. Moreover, samples for the National BSE surveillance program is collected from the abattoir or suspected case which meet the case definition throughout the country. Since year 2003, no positive samples have been detected.
To prevent the introduction of BSE into Thailand, strict import requirements related to BSE are fully comply, such as full traceability of imported animals and the animal products, a ban on the use of meat-and-bone-meal (MBM) in feed for ruminants and prohibited ingredients such as specified risk material (SRM). Furthermore, the imported countries have to be recognizing by the OIE for BSE risk status in order to declare their specific control measures.
The National BSE surveillance program is a continuing program to detect for any suspected case. Most of the samples are obex which collected from healthy cattle in the abattoir. Targeted populations for sample collection are in accordance with the OIE terrestrial code which can define into 4 groups: