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在泰国曼谷大都市区的运河网络系统中，来自双脐螺属 siamensis siamensis 的蜗牛中，麝猫后睾吸虫 s.l. 尾蚴的流行率非常低。

Very low prevalence of Opisthorchis viverrini s.l. cercariae in Bithynia siamensis siamensis snails from the canal network system in the Bangkok Metropolitan Region, Thailand.

机构信息

Animal Systematics and Ecology Speciality Research Unit, Department of Zoology, Faculty of Science, Kasetsart University, Bang Khen Campus, 10900 Bangkok, Thailand.

出版信息

Parasite. 2021;28:2. doi: 10.1051/parasite/2020072. Epub 2021 Jan 8.

DOI:10.1051/parasite/2020072
PMID:33416490
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7792506/
Abstract

The liver fluke Opisthorchis viverrini s.l. is associated with a long-term public health problem in Thailand. However, O. viverrini s.l. infection in Bithynia snails in the canal network system (CNS) in the Bangkok Metropolitan Region (BMR) has never been assessed. This study aimed to investigate the occurrence of B. siamensis siamensis and the prevalence of O. viverrini s.l. infection in this snail in the CNS in BMR along with morphological examination and molecular analyses on O. viverrini s.l. cercariae. The snails were randomly sampled from the CNS in all BMR areas from January 2018 to July 2019. Snail specimens were identified and examined for digenean infection by shedding and dissection. The cercariae were identified using morphology and molecular methods, including PCR with a species-specific primer and a Bayesian phylogenetic analysis of ITS2 sequences. Bithynia siamensis siamensis was found in almost all sampling localities, with different quantities and detected frequencies. From a total of 7473 B. s. siamensis specimens, O. viverrini s.l. infections were detected in the Northern Bangkok, Muang Nakhon Pathom, Krathum Baen, and Lam Luk Ka areas with an overall prevalence of 0.05% (4/7473) and prevalence of 0.22% (1/455), 0.21% (1/469), 0.40% (1/253), and 0.16% (1/614) in individual localities with positive snails, respectively. This study is the first investigation of digenean infection in the canal network system-type habitat in Thailand and revealed extremely low O. viverrini s.l. prevalence.

摘要

肝片形吸虫 Opisthorchis viverrini s.l. 与泰国长期存在的公共卫生问题有关。然而，曼谷大都市区 (BMR) 运河网络系统 (CNS) 中的 Bithynia snails 中是否存在 O. viverrini s.l. 感染尚未得到评估。本研究旨在调查 BMR 中 CNS 中 B. siamensis siamensis 的发生情况以及 O. viverrini s.l. 感染的流行情况，并对 O. viverrini s.l. 尾蚴进行形态学检查和分子分析。2018 年 1 月至 2019 年 7 月，从 BMR 的所有地区 CNS 中随机抽取螺样。通过脱落和解剖检查鉴定和检查螺样的双吸虫感染情况。使用形态学和分子方法鉴定尾蚴，包括使用种特异性引物的 PCR 和 ITS2 序列的贝叶斯系统发育分析。在几乎所有采样地点都发现了 Bithynia siamensis siamensis，其数量和检测频率不同。从总共 7473 只 B. s. siamensis 标本中，在北曼谷、Muang Nakhon Pathom、Krathum Baen 和 Lam Luk Ka 地区检测到 O. viverrini s.l. 感染，总感染率为 0.05%（4/7473），阳性螺的个体地区感染率分别为 0.22%（1/455）、0.21%（1/469）、0.40%（1/253）和 0.16%（1/614）。本研究是泰国首例对运河网络系统型生境中双吸虫感染的调查，结果显示 O. viverrini s.l. 的感染率极低。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba15/7792506/17921fd2142d/parasite-28-2-fig5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba15/7792506/21e363b6c8ae/parasite-28-2-fig1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba15/7792506/d45a1aab670d/parasite-28-2-fig2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba15/7792506/013c46d79d5f/parasite-28-2-fig3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba15/7792506/e65f03215919/parasite-28-2-fig4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba15/7792506/17921fd2142d/parasite-28-2-fig5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba15/7792506/21e363b6c8ae/parasite-28-2-fig1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba15/7792506/d45a1aab670d/parasite-28-2-fig2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba15/7792506/013c46d79d5f/parasite-28-2-fig3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba15/7792506/e65f03215919/parasite-28-2-fig4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba15/7792506/17921fd2142d/parasite-28-2-fig5.jpg

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