The excrement and the excrement polluted water carry a lot of pathogens of them, including the diseaseful virus and worm eggs, which threaten seriously the health of the habitants.

• 粪便中和被粪便污染的饮用水中，含有多种肠道传染病和寄生虫病的病原体，包括致病的病毒和虫卵，严重威胁农民的身体健康。