SRINAGARIND MEDICAL JOURNAL

Volume 35, No. 04, Month JULY, Year 2020, Pages 451 - 462

Seasonal fluctuation of cercarial trematode infections in freshwater snails of bithynia siamensis goniomphalos from in-and out-season rice paddy fields, khon kaen province, thailand

Monticha Chaiyasaeng, Chanisala Sereewong, Chakkris Chaiyos, Naiyana Senasri, Apiporn T. Suwannatrai, Thewarach Laha, Smarn Tesana

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Background and Objective: Trematode infections have been considered as important public health in Thailand. This study aimed to investigate the prevalence of trematode infections in Bithynia siamensis goniomphalos snails and analyze the association between prevalence of trematode infections with many factors. Method: Cercarial infections in B. si amensi s goniomphalos were studied in 2 localities of in- and out-season rice paddy fields in Khon Kaen Province (January 2014-February 2015). Results: The average prevalence of cercarial infections in snails during the studying period was 2.82% (14 types of cercariae) in locality 1 and 2.67% (11 types of cercariae) in locality 2. The prevalence of cercarial infections with Ophthalmoxiphidiocercariae and Pleurolophocercous in female were higher than male snail. The prevalence of cercarial infections with Xiphidiocercariae (type virgulate 1, 2, and 3), Ophthalmoxiphidiocercariae, and Pleurolophocercous in large-sized snails were higher than medium and small-sized snails. Snails which were found in rainy season were higher prevalence of infection with Xiphidiocercariae type virgulate 2, Ophthalmoxiphi diocercariae and Pleurolophocercous than hot-dry season. Snails which were found in cool-dry season were higher prevalence of infection with Xiphidiocercariae (type virgulate 2 and 3) Ophthalmoxiphidiocercariae, and Pleurolophocercous than hot-dry season. But the prevalence of cercarial infections in the correlation factors of mean daily air temperature, average monthly rainfall, and salinity were not different significantly. Conclusions: Bithynia siamensis goniomphalos snails served as intermediate host of various trematodes. Female snail was higher prevalence of infection than male snail. Large-sized snails were higher prevalence of infection than were medium-sized snails.

Keywords

cercarial infection, Bithynia siamensis goniomphalos, in- and out-season rice paddy field

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