Results: A total of 1,168 stool samples
were obtained from 516 males and 652 females, aged 5-90 years. Stool examination showed that 2.48% were
infected with O. viverrini. Males were slightly more likely to be infected than females, but the different was not
statistically significant. O. viverrini infection was most frequent in the 51-60 year age group and was found to
be positively associated with education and occupation. Positive results were evident in 16 of 32 districts, the
highest prevalence being found in Non Daeng with 16.7%, followed by Pra Thai with 11.1%, Kaeng Sanam
Nang with 8.33%, and Lam Ta Men Chai (8.33%) districts.