Natural Trematode Infections of Freshwater Snail Melanoides jugicostis Hanley & Theobald, 1876 (Family Thiaridae), the First Intermediate Host of Animal and Human Parasites in Thailand
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Abstract
Melanoides jugicostis Hanley and Theobald (1876), a freshwater snail was reported as a species with wider occurrence, ranging from Burma to Thailand and Java. In Thailand, this species was found a few localities; however they can transmit parasites, as the first intermediate host of animal and human trematodes. The aim of this study was evaluated the natural infections of M. jugicostis snail in Thailand. The results of this work were data for veterinary and public health of surrounding study areas. The investigation was done by opportunistic collection between February and March 2012. The collected snails were examined trematode infections by shedding and crushing methods, based on a comparative analysis on morphology and anatomy of cercariae were described from living cercariae, fixed cercariae and cercarial drawing. A total of 555 snails were collected, 103 were found cercarial infections, the infection rates was 18.6% (103/555). Four types and four species of cercariae were categorized. They were Parapleurophocercous cercariae (Haplorchis pumilio), Pleurophocercous cercariae (Centrocestus formosanus), Xiphidiocercariae (Loxogenoides bicolor), and Furcocercous cercariae (Alaria mustelae). The infection rates were 16.04%, 0.54%, 1.08%, 0.72%, and 0.18%, respectively.
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