Chin J Schisto Control ›› 2016, Vol. 28 ›› Issue (5): 497-.

Role of goat in transmission of schistosomiasis japonica III Environmental contamination by goat feces and prediction of environments at high risk of S. japonicum infection

LIANG You-sheng1|WANG Yi-an1|SHEN Xue-hui2|WANG Wei1|QU Guo-li1|XING Yun-tian1|DAI Jian-rong1*

1. 1 Jiangsu Institute of Parasitic Diseases|Key Laboratory of National Health and Family Planning Commission on Parasitic Dis? ease Control and Prevention|Jiangsu Provincial Key Laboratory on Parasites and Vector Control Technology|Wuxi 214064|Chi? na；2 Dantu District Center for Disease Control and Prevention|Zhenjiang City|Jiangsu Province|China
• Online:2016-10-25 Published:2016-10-26
• Contact: DAI Jian?rong

羊在日本血吸虫病传播中的作用 II I羊粪对环境的污染及血吸虫感染高危环境预测

1. 1江苏省血吸虫病防治研究所、国家卫生和计划生育委员会寄生虫病预防与控制技术重点实验室、江苏省寄生虫与媒介控制技术 重点实验室（无锡214064）；2江苏省镇江市丹徒区疾病预防控制中心
• 通讯作者: 戴建荣
• 作者简介:梁幼生|男|博士|研究员。研究方向：血吸虫生物学及血吸虫病预防与控制
• 基金资助:
江苏省临床医学科技专项（BL2014021）；江苏省卫生厅项目（X200902、X201408、X201410）；江苏省无锡市卫生局卫生科研项目 （Q201510）；江苏省镇江市社会发展科技项目；江苏省镇江市丹徒区科技计划项目

Abstract: Objective To quantitatively estimate the range and area of environmental contamination by the feces of Schistoso? ma japonicum?infected that were freely grazed，so as to provide the theoretical evidence for the scientific assessment of the role of the freely grazed goat in the transmission of schistosomiasis japonica and development of control strategy. Methods All the fecal samples excreted by the infected goat at daytime（12 h）were collected by using a self?made goat fecal collector，weighed and counted. The quantity and dispersal of the feces excreted by the freely grazed goat at daytime under a natural condition were investigated，and the walking route and speed of the freely grazed goat at daytime were recorded with a multifunction GPS data logger. The maximum range and area of the environment contaminated by the feces of the freely grazed goat at daytime were esti? mated，and the maximum range and area of the Oncomelania hupensis snails that may be infected by the schistosome miracidium released from the eggs in the fecal samples of the freely graze goat at daytime were calculated. Results During the walking along the marshland at daytime（12 h），the quantity of the feces execrated by the freely grazed infected goat was（232.8 ± 39.8） g per goat，and the fecal samples were composed of（819.2 ± 152.1）pellets. The goat had a mean walking speed of（0.522 7 ± 0.099 7）km/h，and the longest distance，largest radius and largest range of walking activity were（6.272 4 ± 1.195 8）km， 3.136 2 km and（3 191.113 0 ± 1 189.709 4）hm2at daytime，respectively. The area of the snails that may be infected by the mi? racidium released from the eggs in the fecal samples of the freely graze goat（range of key regions for infected snails detection and control）at daytime was estimated to be（3 210.717 5 ± 1 190.907 3）hm2. Conclusions The intensity of environmental contamination by the eggs in the fecal samples of the freely grazed goat is linked to the number of infected goat. The contamina? tion range caused by the feces of the freely grazed goat with fixed fences is relatively stably kept within the walking range at day? time，and the range and area of goat fecal contamination is associated with the number of households that breed goat and the dis? tribution of goat fence. The area of the snails that may be infected by the miracidium released from the eggs in the fecal samples of the freely graze goat is larger than the area of setting contaminated by the eggs in the goat feces，indicating that the range of in? fected snail examination and control is larger than the range of goat feces detected.

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