Is bacteria good for humans? Give examples

Good and bad bacteria live freely in the human body. Therefore, it is not worth killing all bacteria by upsetting the natural balance. During production, beneficial bacteria are even specially planted in foods that a person must then include in their diet. The benefit of bacteria is that they protect the intestinal microflora, preventing the development of fungus, inflammation. As a rule, there are bacteria in medicines. Good bacteria: streptomycetes, lactic acid bacteria, bifidobacteria.