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Think of bacteria, we immediately think of the agents, which are dangerous to people or the causes of diseases. Actually, there are 2 kinds of bacteria: harmful bacteria and useful bacteria. Harmful bacteria cause dangers to people, while useful bacteria help transformation processes of body. The most common useful bacteria are intestinal bacteria, which are called Lactobacillis acidophilus and Bifidobacterium.

People usually think that useful bacteria parasitize on human's body, but actually, they are considered as an important part of human's body. If there is lack of those bacteria or something wrong happen with them, it will cause diseases, and to the contrary, if useful bacteria work on the balance, they will help digestive work effectively and prevent from diseases. These useful bacteria come in digestive tract and develop quickly, create a bacterial population in intestine. They have both competitive function with other harmful bacteria and the function of useful participating transformation in body. The quantity of useful bacteria is very low in stomach, increases a bit more in small intestine and much more in large intestine. Therefore, the role of useful bacteria is primary carried out in large intestine. Large intestine is the end of digestive tract, where the last transformation of waste happens; thus, here is the extremely harmful environment, where a lot of harmful bacteria exist and grow. So, large intestine is infected easier than small intestine, such as large intestinal neoplasm, chronic colitis, and so on.
First of all, let's examine the role of useful bacteria in inhibiting the development of pathogenic bacteria, such as dysentery, typhoid. If the quantity of useful bacteria is a large number, they will compete and inhibit the development of pathogenic bacteria. If the quantity of useful bacteria is small, the pathogenic bacteria will have opportunity to develop and cause diseases. After being treated by using long-term antibiotic medicines, useful bacteria may be killed; and therefore, we need to intensify in order to receive the quantity of useful bacteria back by food intake as well as using drugs contains these bacteria.
The study has proved the role of useful bacteria in preventing and treating some diseases. The disease has been discussed the most is the irritative intestine syndrome, which is increasing in many modern societies nowadays. Its symptoms are frequent stomach upset, going to stool many times a day. This disease is not really

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