This is because during the long evolutionary process, flies and bacteria have formed a mutually adaptive relationship.
Scientists have found that most of the bacteria on flies hide in their digestive tracts. These bacteria, which are very harmful to the human body, can only exist in the fly's digestive tract for five or six days before dying. The rest will be excreted from the body with feces, causing no harm to the fly at all.
In addition, flies also contain an antibacterial active protein in their bodies, which can eliminate and kill various germs. Therefore, although flies stay in dirty places all year round and carry many germs on their bodies, they themselves are not very harmful. The reproduction rate of flies is very high, and they are a very harmful insect.
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