The survival time of bacteria in human stool after leaving the human body is related to the environment in which it exists, as well as to the difference in the type of bacteria. Generally, the stool exists in a lower temperature, higher humidity environment for a longer period of time, the general bacteria will survive for more than a month, if the patient does not have direct contact with the stool, generally will not bring harm to the human body, but in order to maintain good health, or need to live in the environment to maintain cleanliness and hygiene. If the stool is exposed to the sun or in a higher temperature environment, the bacteria will survive for a shorter period of time, usually about half an hour or so will easily lead to the death of the bacteria. Different types of bacteria have different survival times in the stool. Some bacteria have a higher survival rate in the stool, while others do not survive after leaving the body with the stool. For example, E. coli bacteria are more heat-resistant and remain in the stool for a longer period of time, while H. pylori bacteria are very demanding and survive for a shorter period of time after leaving the body with the stool.