Microbiology is the science and study of microorganisms, i.e. Living beings, which as individuals with the naked eye not can be recognizedThese include, for example, Bacteria, fungi, protozoa as well as unicellular and few-celled algae and viruses.
Source: Wikipedia
Here go we first look in more detail at viruses and bacteria.
This is one of the few things these different pathogens have in common. Otherwise, the two groups of pathogens are very different in many areas and sometimes quite useful.