Something unseen, but potentially dangerous. Something with an uncanny ability to survive and reproduce in even the most hostile environments. Something capable of attacking the Station's crew and even the Space Station itself. Of course we're not talking about some man-eating alien from a science fiction movie. Microbes will be the last ones in the Station, too.
Microbes are a fact of life anywhere that humans go.
The majority are harmless, and several types are actually beneficial to humans. Nevertheless, certain microbes can pose a health threat to the Station's crew and even attack the materials and hardware of the Station itself. Scientists and engineers at NASA must find ways to keep such microorganisms on the Space Station under control. Living in a Microbial World A 5000x scanning electron microscope image of E. Coli bacteria. It is a normal resident of human intestines and provides vitamin K and some of the B vitamins.