Microorganisms are medically very valuable because some of them produce substances from which we can benefit. Substances that inhibit the growth of other microorganisms can be isolated and used as antibiotics. In addition, microorganisms are needed for the production of vaccines, insulin and many other compounds.
Explanation for children: In medicine, microorganisms are of great importance because they sometimes produce substances that are also useful for us. Thanks to their help we can obtain antibiotics, vaccines and other medicines.