An overall apparent prevalence of 11.4% of O.viverrini infections was found in the investigated population in Binh Dinh Province, Central Vietnam, which is considered a moderate prevalence. Among the individuals who declared having eaten raw fish dishes, the prevalence was 25.5%.
Although we were able to confirm O.v infection in only 11 of the 29 individuals shedding trematode eggs, our findings strongly suggest O.v 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.
C.sinensis has until now only been found in North Vietnam and Haplorchis metacercariae have found in less than 1% of "diec" fish in Binh Dinh Province, suggesting a low prevalence of minute intestinal fluke infections.
The preference of men to eat raw fish and drink alcohol may explain why males are at a significantly higher risk of infection with O.v. While age was not a significant risk factor in this study it has been strongly associated with higher infection rates in Thailand.