Most are harmless, and several kinds actually benefit humans. But some microbes can pose a health threat to the Station crew, and even attack the hardware and materials of the Station. NASA scientists must find ways to keep such microorganisms under control. Living in a microbial world E. Coli bacteria magnified 5000 times. It lives harmlessly in human intestines and provides vitamin K and some B vitamins.
Microbes are everywhere.
We even release microbes when we breathe, Roman explains. They are in our clothes, on our skin and hair, and inside our bodies. We all live in the company of stow-away microbes. In fact, bacteria in people's intestines help to digest food and provide some nutrients such as vitamin K. Our resident microbes also actually protect us from infection by competing with dangerous germs looking for a place to grow. It is natural for a person to live with their own resident microbes.