Well, animal feces is commonly used as a fertilizer. I think it would be bad news for a plant if bacteria were traveling around inside it. People reusing human

Well, animal feces is commonly used as a fertilizer. I think it would be bad news for a plant if bacteria were traveling around inside it. People reusing human wastes generally try to compost it for a while, I think, probably partly to reduce the risk of diseases, but probably also in a large part to remove the foul smell. Shoveling shit isn't fun.