In our study, a confirmatory test was done by morphological and molecular identification of adult worms recovered from stools of patients after treatment. All 11 consenting individuals shed adult O.viverrini following praziquantel treatment. Although we were able to confirm O. viverrini infection in only 11 of the 29 individuals shedding trematode eggs, our findings strongly suggest O. viverrini infections in all those people. We found a strong correlation between the faecal egg output and the number of expelled worms in these consenting individuals.