Snails and freshwater fish were examined from four ponds in the Meinung
township in which Clonorchis sinensis was known
to be endemic 18 years ago. No metacercariae were found in 478
Tilapia nilotica, whereas of 451
Ctenopharyngodon idellus examined, 16.2%,
3.3% and 0.9% were found to be infected with Haplorchis
pumilio, H. taichui and Clonorchis
sinensis, respectively. In addition, there were some
unidentified metacercariae in 12.0% of Ctenopharyngodon
idellus examined. Overall, no positive correlation between
infection rates and sizes of infected fish was shown. Six species of snails
were collected in this survey and two frequently-occurring snails,
Melanoides tuberculata and
Thiara granifera were commonly infected with
H. pumilio. Reasons for the prevalence of
Haplorchis species and the absence of
Clonorchis sinensis in fish and snail hosts
in a previously reported endemic area for human clonorchiasis are
discussed.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.