Fig. 2.

Prevalence of OV MC-infected fish in northeastern Thailand. Natural fish were obtained from 74 bodies of water in various areas of 20 provinces in northeastern Thailand according to the Departments of Prevention and Control of Disease (DPC), DPC5, DPC6, and DPC7. Fish, 5-10 kg, were collected from each province at 2 different seasons of the year, rainy and winter. Fish were digested with 0.25% artificial pepsin and examined for the presence of OV MC. The percentage of OV MC prevalence was calculated from the number of positive sites per number of sites sampled.