Studies on growth and distribution of Angiostrongylus cantonensis larvae in Ampullarium canaliculatus.

The intramolluscan development of Angiostrongylus cantonensis larvae in Ampullarium canaliculatus, a fresh-water migrant snail which multiplies in tremendous rate in Taiwan, was followed for 28 consecutive days in this study. The snails were infected with first stage larvae of A. cantonensis and groups of three snails were sacrificed daily to study various larval stages in different organs. A. cantonensis larvae were found in all snails examined. During the first four days, they were obtained only from the digestive tract. Mouth is thus suggested as the primary route of natural infection. The first molt was observed on the fifth day of infection, and the second molt, the 12th day. Molting occurred in almost all kinds of organs examined. Studies on tissue tropism showed that the predilection site of A. cantonensis in this freshwater snail was headfoot region. Relatively few larvae were found in visceral organs including liver, heart, and ovary. Most parasites, 62.1%, recovered on the 28th day of infection were third-stage larvae.

Medically important snails of Kinmen (Quemoy) Islands.

A survey and collection of the snails of medical importance were conducted in June, 1980 on Kinmen Islands. More than 2,700 snails were collected from 23 different localities. They were preserved, carefully classified, and compared in habitat distribution with snails of Taiwan. A total of fourteen species of snails was found. This study has led to the establishment of snail fauna of Kinmen. The relationships of these snails with some snail-borne diseases are discussed.