Studies on growth and distribution of Angiostrongylus cantonensis larvae in Ampullarium canaliculatus.
A. canaliculatus were exposed to Angiostrongylus cantonensis L1 and the resulting infection was monitored for 28 days. L2 were first observed on day 5 pi, and their numbers peaked on day 22. L3 were recovered from day 12 onwards, and constituted 62.1% of larvae recovered on day 28. During the first 4 days pi, larvae were only observed in the digestive tract, which suggests that they invade the snail through the mouth. After day 4, larvae were mainly found in the headfoot; few were recovered from the viscera.