Surveillance of epidemic factors of schistosomiasis in wetlands in Sichuan Province
10.16250/j.32.1374.2018008
- VernacularTitle:四川省湿地血吸虫病流行因素监测
- Author:
Yong MAO
1
;
Jia XU
1
;
Liang XU
1
;
Ling CHEN
1
;
Jia-Jia WAN
1
;
Rong-Zhi LI
1
;
Meng TANG
2
;
Chao-Kun ZHONG
3
;
Fang YANG
4
;
Hui-Rong XU
5
;
Yu-Ling YE
6
;
Zi-Song WU
1
Author Information
1. Sichuan Provincial Center for Disease Control and Prevention, Chengdu 610041, China
2. Danling County Center for Disease Control and Prevention, Sichuan Province, China
3. Guanghan Municipal Center for Disease Control and Prevention, Sichuan Province, China
4. Xichang Municipal Center for Disease Control and Prevention, Sichuan Province, China
5. Pujiang County Center for Disease Control and Prevention, Sichuan Province, China
6. Qingbaijiang District Station of Schistosomiasis Control, Chengdu City, Sichuan Province, China
- Publication Type:Journal Article
- Keywords:
Schistosomiasis;
Oncomelania snail;
Wetland;
Sichuan Province
- From:
Chinese Journal of Schistosomiasis Control
2019;31(3):307-310
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the epidemic factors of schistosomiasis in wetlands in Sichuan Province, so as to provide scientific evidence for the prevention and control of schistosomiasis in wetlands. Methods The artificial and natural wetlands were selected from Sichuan Province, and the relevant data regarding wetlands were collected. Routine snail survey, investigation on human morbidity due to schistosomiasis, snail diffusion experiments, questionnaire survey, determination of water infectivity and retrospective survey were conducted. Results In Sichuan Province, the mean densities of living snails were 0.003 snails/0.1 m2 and 2.033 snails/0.1 m2 in the upper and lower reaches of the Meiwan Reservoir wetlands, 0.08 snails/0.1 m2 in the Jinyan Lake of Guanghan City, 0.21 snails/0.1 m2 in Muhe River of Guanghan City, and 0.02 snails/0.1 m2 prior to the construction of Qiong-hai wetland park in Xichang City in 2015. Artificial simulation experiments showed that the largest distance of snail diffusion in water was 2 000 m. There were 8.80% (41/466) of subjects that lived neighboring wetlands, worked in wetlands and visited wet-lands having infested water contact behaviors. A total of 690 sentinel mice were assigned, and no Schistosoma japonicum infection was detected in the 677 mice dissected. Retrospective survey showed that the construction of the Meiwan Reservoir caused the spread of schistosomiasis in Dailing County, and snails were found in the ditches entering the Jinyan Lake and in Jinyan Lake areas 5 years following the construction of the Jinyan Lake in Guanghan City, with S. japonicum -infected snails detected in the ditches entering the Jinyan Lake. Conclusions O. hupensis snails are found in some wetlands in Sichuan Province. Protection of wetlands and snail control with environmental improvements are recommended for the prevention of snail importation in natural wetlands, while in artificial wetlands, thorough snail control is recommended during the construction of the wetlands because of the likelihood of snail importation via water systems. In addition, both natural and artificial wetlands require long-term systematic surveillance of schistosomiasis.
