Assessment of schistosomiasis transmission risk in Nanjian County of Yunnan Province in 2019
10.16250/j.32.1374.2020027
- VernacularTitle:2019 年云南省南涧县血吸虫病传播风险评估分析
- Author:
Chun-Hong DU
1
;
Hui YANG
2
;
Meng-Xian YANG
3
;
Yun ZHANG
1
;
Jia-Yu SUN
1
;
Li-Fang WANG
1
;
Jia-Qi YAN
1
;
Mei-Fen SHEN
1
;
Yi DONG
1
Author Information
1. Yunnan Institute of Endemic Diseases Control and Prevention, Dali 671000, China
2. Dali Institute of Schistosomiasis Control and Prevention, Yunnan Province, China
3. Nanjian County Station of Schistosomiasis Control and Prevention, Yunnan Province, China
- Publication Type:Journal Article
- Keywords:
Schistosomiasis;
Oncomelania snail;
Wild feces;
Source of infection;
Transmission risk;
Nanjian Count
- From:
Chinese Journal of Schistosomiasis Control
2020;32(5):531-533
- CountryChina
- Language:Chinese
-
Abstract:
Objective To assess the schistosomiasis transmission risk in Nanjing County, so as to provide the scientific evidence for the development of the schistosomiasis control strategy and consolidation of the control achievements. Methods On May 2019, the Deqiu Village in Deqiu Town and Baiyun Village in Nanjing Town of Yunnan Province, where schistosomiasis were historically relatively highly endemic, were selected to assess the risk of transmission of schistosomiasis by means of a retrospective review of the data pertaining to the historical endemic situation and schistosomiasis control, combined with a cross-sectional survey of snail and wild feces distribution. Results During the period between 2017 and 2018, the mean sero-prevalence rates of Schistosoma japonicum infections were 6.76% (202/2 990) and 2.86% (142/4 971) in humans and 0 (0/1 160) and 10.65% (31/291) in bovines in Deqiu and Baiyun villages of Nanjian County, respectively; however, no egg-positives were identified; in addition, there were 21.06 hm2 snail habitats found, but no S. japonicum infections were detected in snails. In 2019, there was 6.17 hm2 snail habitats detected, with 2.17% (245/11 298) occurrence of frames with snails and a 0.06 snails/0.1 m2 density of living snails; however, no positives for nucleic acid detection were seen in snails; among the 136 wild fecal samples captures from 23 settings, no S. japonicum infections were identified. Conclusions The risk of schistosomiasis transmission remains at a low level in Nanjian County; however, the factors affecting the transmission of schistosomiasis have not been completed eliminated. The integrated schistosomiasis control strategy with an emphasis on the control of the source of S. japonicum infections requires to be reinforced to consolidate the control achievements.
