1. Kidchakan Supamattaya Aquatic Animal Health Research Center; Department of Aquatic Science; Faculty of Natural Resources; Prince of Songkla University; Hat Yai Songkhla Thailand
2. Department of Pathobiological Sciences; School of Veterinary Medicine; Louisiana State University, Baton Rouge LA USA
3. School of Animal Science; Louisiana State University Agricultural Center; Louisiana State University; Baton Rouge LA USA