An analysis of surveillance results of intermediate hosts of <i>Paragonimus</i> in Xiuning County, Anhui Province, China, 2019-2021

LIU Dao-hua, JIN Yu, LI Qi-yang, YANG Rong-sheng, WANG Tian-ping, CAO Zhi-guo

doi:10.11853/j.issn.1003.8280.2023.05.006

Chinese Journal of Vector Biology and Control >

2023 , Vol. 34 >Issue 5: 617 - 621

DOI: https://doi.org/10.11853/j.issn.1003.8280.2023.05.006

Vector Surveillance

An analysis of surveillance results of intermediate hosts of Paragonimus in Xiuning County, Anhui Province, China, 2019-2021

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1. Department of Parasitic Disease Control and Prevention, Anhui Institute of Schistosomiasis Control, Hefei, Anhui 230031, China

Received date: 2023-02-28

Online published: 2023-10-27

Supported by

Scientific Research Project of Anhui Provincial Health Commission (No. AHWJ2021b028)

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Abstract

Objective To investigate the status of Paragonimus infection in intermediate hosts in Xiuning County, Anhui Province, China, so as to provide scientific evidence for formulating paragonimiasis control strategies.Methods From 2019 to 2021, small freshwater snails and crabs were captured in nine administrative villages in three towns along Xiuning river, Heng river, and Shuaishui river in Xiuning County. The freshwater snails and crabs were morphologically identified, and then were examined for Paragonimus cercariae and metacercariae, respectively. The metacercaria infection index of crabs was calculated to determine the levels of paragonimiasis epidemic foci. EpiData 3.1 and SPSS 23.0 were used for statistical analysis.Results Two kinds of small freshwater snails were collected, which were morphologically identified as Assiminea sp. and Semisulcospira libertina. Among a total of 3 826 Assiminea snails, no Paragonimus cercariae were detected. Among a total of 10 440 S. libertina snails, the overall infection rate was 0.89% (93/10 440); the infection rate was highest in Ru village (23/1 021, 2.25%) and lowest in Yanjiao village (4/743, 0.54%), with a statistical difference in the infection rate between the surveyed points (χ²=24.784, P=0.002). The crabs were identified as Sinopotamon yangtsekiense, and the overall infection rate was 21.41% (106/495). The infection rate of the crabs was highest in Ru village (25/76, 32.89%) and lowest in Yanjiao village (3/51, 5.88%), with a statistical difference between the surveyed points (χ²=16.225, P=0.039). The metacercaria infection index results of Ru village, Nantang village, and Jiangtan village were 0.12, 0.02, and 0.03, respectively, all being level-Ⅲ epidemic foci of paragonimiasis.Conclusions The intermediate hosts of Paragonimus in Xiuning County had a relatively high infection rate. Public health education on paragonimiasis should be strengthened to prevent the epidemic of paragonimiasis in this area.

Key words： Paragonimus; Intermediate host; Surveillance

Cite this article

LIU Dao-hua, JIN Yu, LI Qi-yang, YANG Rong-sheng, WANG Tian-ping, CAO Zhi-guo . An analysis of surveillance results of intermediate hosts of Paragonimus in Xiuning County, Anhui Province, China, 2019-2021[J]. Chinese Journal of Vector Biology and Control, 2023 , 34(5) : 617 -621 . DOI: 10.11853/j.issn.1003.8280.2023.05.006

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