Conclusions
- The phylogenetic relationship of the Thai PEDV strain indicated that the recent Thai PEDV isolates differed genetically from previous Thai isolates.
- Despite precautions, sporadic outbreaks continue to occur. In addition, disease transmission frequently occurs due to the purchase of new stock with improper gilt acclimatization and biosecurity.
- Immunity induced through vaccination, currently unavailable in Thailand, does not provide lifelong protection from this virus.
- However, vaccination is recommended to encourage specific immunity to PEDV in all stock when an acute outbreak occurs.
- Undoubtedly, effective biosecurity is a key management tool for PED prevention and control.
- Our data suggested that all recent Thai PEDV isolates are genetically similar to the Chinese isolates identified in 2004.
- Further analysis of the entire S gene of PEDV and of other isolates in neighboring countries is needed to show the molecular epidemiology of the Chinese-like strain.