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.
Under natural conditions, the emergence of Opisthorchis viverrini cercariae from naturally infectedBithynia (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 sheddedfrom each field infected B.(D.) s. goniomphalos was recorded daily. The maximum output from one snail was1,728 cercariae in a day. The total cercarial output from all five infected snails was 56,555 and the maximum oftotal cercariae shed from one snail was 27,692. The field-infected B. (D.) s. goniomphalos could survive for 70days after the snails were collected.
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