CHINESE JOURNAL OF PARASITOLOGY AND PARASITIC DISEASES >
Intermediate host population and infection status of Paragonimus in southeastern Youxi County, Fujian Province
Received date: 2021-03-31
Revised date: 2021-05-21
Online published: 2021-11-10
Supported by
National Natural Science Foundation(3206130239);Zhangzhou Natural Science Foundation of Fujian(ZZ2017J09);Zhangzhou Key Project of Science and Technology Plan(ZZ2017ZD05)
From 2015 to 2020, four villages in southeast Youxi County, Fujian Province (Puning Village and Xiwei Village in Xiwei Town, Chimu Village and Zhujian Village in Tangchuan Town) were selected as survey sites. Freshwater snails and crabs were collected in one shallow and one deep gully from each village and were identified by morphological characteristic. Paragonimus cercariae from snails and cysticerci from crabs were isolated and identified. Two puppies were fed with 80 metacercariae of P. westermani or P. skrjabini isolated from crabs. The eggs were examined in feces starting 60 days after infection, and the puppies were dissected to collect adult worms at 80 days and 100 days after infection. The adult worms were identified by morphological characteristics. We collected 7 405 freshwater snails from three species: Semisulcospira liberlina, the first intermediate host of P. westermani, and undefined Triculini and Erhaia, the first intermediate host of P. skriabini. The infection rates of P. skrjabini cercariae in Puning Village (Triculini), Xiwei Village (Triculini) and Chimu Village (Erhaia) were 0.39% (6/1 546), 0.17% (2/1 179) and 0.26% (5/1 898), respectively. The infection rate of P. westermani cercariae in S. liberlina in Zhujian Village was 0.11% (1/917). A total of 319 crabs from five species （S. fukienense, B. yonganense, B. youxiense, N. fujianense, and undefined Huananpotamon） were collected. All species were the second intermediate hosts of Paragonimus. The total infection rate of freshwater crabs was 25.71% (82/319). The average infection intensity was 7.34 metacercariae per crab, and the infection index was 3.09. The infection rate of P. skrjabini metacercariae in B. youxiense and S. fukienense in Puning Village was 41.89% (31/74). The infection rate of P. skrjabini metacercariae in undefined Huananpotamon and S. fukienense in Xiwei Village was 22.67% (17/75). The infection rate of P. skrjabini metacercariae in S. fukienense, B. yonganense, and N. fujianense in Chimu Village was 30.0% (21/70). The infection rate of P. westermani metacercariae in S. fukienense, B. yonganense, and N. fujianense in Zhujian Village was 13.00% (13/100). A total of 12 and 10 adult worms of P. westermani and P. skrjabini, respectively, were collected from puppies infected with metacercariae, respectively. Many species of Paragonimus first intermediate host snails and Paragonimus second intermediate host crabs were found in the southeast Youxi County, Fujian Province, which is a moderate-risk area for Paragonimus infection.
Key words： Paragonimus; Intermediate host; Snail; Crab; Infection rate; Youxi County
Jun LUO , Ji-qing CHEN , Dian-wei JIANG , Pei-cong ZHOU , Mao-rong CAI , You-zhu CHENG . Intermediate host population and infection status of Paragonimus in southeastern Youxi County, Fujian Province[J]. CHINESE JOURNAL OF PARASITOLOGY AND PARASITIC DISEASES, 2021 , 39(5) : 646 -651 . DOI: 10.12140/j.issn.1000-7423.2021.05.022
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