As a microorganism, avian influenza virus is harmful to our human body. Are all microorganisms harmful to us? Tell me your reasons.

Of course not. Microorganisms are both harmful and beneficial to human beings. The following are some examples of my personal views.

There are Escherichia coli in human intestines, but Escherichia coli can inhibit the growth of other microorganisms that decompose protein. A certain amount of Escherichia coli in the intestine is harmless, and Escherichia coli itself can extract some chemicals beneficial to human scientific research through artificial technology.

Lactic acid bacteria belong to a kind of anaerobic bacteria. Among them, lactic acid bacteria are often used to make yogurt.

Some viruses can be used for scientific research after inactivation, which can promote the fusion of animal cells.

There are many such examples. In the big environment of biosphere, every living thing must have its value and significance, and whether it is harmful or beneficial is relative. But even if we look at other creatures from the perspective of human beings, we can't say that "all microorganisms are harmful to human beings."