It can occur during production, from manure and water, during processing from environmental sources and during the final handling and packing, possibly as a result of poor human sanitation.

这可能来自于生产阶段的粪肥和水，有可能是在加工处理过程中来自于周围的环境，还有可能是在包装环节由于缺乏卫生设备造成的。

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"The two scariest examples were human stool samples stored in the same refrigerator as employee lunches," she says, "and cow manure samples refrigerated next to food items."

最可怕的2件事是：一是将人的粪便样品与员工食物放在同一个冰箱里，二是将牛的饲料放在食物的旁边。

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Wang Shihou aren't angry and he teaches the refinement of human dung, cow dung, manure and plant ash.

王世厚的气消了，便给儿子讲人粪、牛粪、猪粪、草木灰的妙用。

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If the genetically modified pigs are approved for human consumption by the Canadian Government, and they are produced in large numbers, the scientists said that the manure's harmful effects could be reduced.

BBC: GM pigs to produce cleaner manure