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AbstractThis study aimed to investigate the pulmonate snail species in the vicinity of the cercarial dermatitis outbreak area in southern Thailand. In 2020, an outbreak of cercarial dermatitis was reported in Chana district, Songkhla Province, caused by the ruminant schistosome    Schistosoma   indicum    and its snail intermediate host    Indoplanorbis   exustus   . In the present study, 1,175 pulmonate snails were collected between October 2021 and October 2022 from five provinces covering 34 locations in southern Thailand. Seven pulmonate snail species were identified based on shell morphology, including    Amerianna   carinata   ,    Gyraulus   bakeri   ,    G.   convexiusculus   ,    G.   hubendicki   ,    Physella   acuta   ,    Indoplanorbis   exustus   , and    Radix   rubiginosa   . Among these snails, eight species, and five types of cercariae were identified, viz. type (i) Echinostome cercariae consisted of    Echinoparyphium   recurvatum   ,    Echinostoma   spiniferum   , and    E.   revolutum   , type (ii) Brevifurcate-apharyngeate cercariae consisted of    Schistosoma   indicum    and    S.   spindale   , type (iii) Brevifurcate-pharyngeate-clinostomatoid-cercariae was represented by    Clinostomum   giganticum   , type (iv) Longifurcate–pharyngeate cercariae (strigea cercaria) was    Diplostomum   baeri   eucaliae   , and type (v) Ophthalmoxiphidiocercaria. Among the seven pulmonated snail species, three were found to be infected, viz.    G.   convexiusculus   ,    I.   exustus   , and    R.   rubiginosa   , with infection rates of 1.14% (2/176), 0.25% (2/802), and 4.02% (7/174), respectively.

﻿Freshwater pulmonate snails and their potential role as trematode intermediate host in a cercarial dermatitis outbreak in Southern Thailand

Freshwater pulmonate snails and their potential role as trematode intermediate host in a cercarial dermatitis outbreak in Southern Thailand