Hi, C. difficile is contagious, but not everybody infected gets sick. C. diff bacteria actually exists all around us. It’s in the air, water, soil, and in the feces of humans and animals. And it exists in health care facilities, like nursing house. Many people have the bacteria in their intestines and never have any symptoms. Some people take antibiotics for a long time, the antibiotics killed a lot of Good bacteria in the intestines. These good bacteria are like guards, losing them means C. diff could grow unchecked and then make you sick.