Phongsasakulchoti, PhunthiraSri-aroon, PusadeeKerdpuech, Yupa2009-05-272009-05-272005-11-28Phongsasakulchoti P, Sri-aroon P, Kerdpuech Y. Emergence of Opisthorchis viverrini cercariae from naturally infected Bithynia (Digoniostoma) siamensis goniomphalos. The Southeast Asian Journal of Tropical Medicine and Public Health. 2005 ; 36 Suppl 4(): 189-91http://imsear.searo.who.int/handle/123456789/32358The Southeast Asian Journal of Tropical Medicine and Public Health.Under natural conditions, the emergence of Opisthorchis viverrini cercariae from naturally infected Bithynia (Digoniostoma) siamensis goniomphalos showed diurnal periodicity, peaking between 8:00-10:00 AM. The cercariae did not emerge during darkness, but low-intensity light could induce a release. Cercariae shedded from each field infected B.(D.) s. goniomphalos was recorded daily. The maximum output from one snail was 1,728 cercariae in a day. The total cercarial output from all five infected snails was 56,555 and the maximum of total cercariae shed from one snail was 27,692. The field-infected B. (D.) s. goniomphalos could survive for 70 days after the snails were collected.engAnimalsCircadian RhythmDisease VectorsEcologyFasciola hepatica --isolation & purificationHost-Parasite InteractionsMicrovilli --ultrastructureOpisthorchis --isolation & purificationParasite Egg CountSnails --parasitologySurvivalTime FactorsJournal Article