Information on the
species composition of cercariae is a pre-requisite
for any study on the epidemiology of the veterinary or
biomedical importance of trematodes. Hence, a study
of the epidemiological situation of cercarial infection
in freshwater snails in Chiang Mai province was carried
out, basing on the original data from a large scale survey
of cercaria infections. This is the first step for providing
new information on the latest distribution of trematode
infection and for the development of the effective control