Microbiology is the study of organisms too small to be seen without the aid of a microscope. For example microbiology involves the isolation, growth and identification of microoganisms. The discipline covers organisms such as bacteria, fungi, algae and protozoa and infectious agents such as viruses.
Microorganisms often get a bad press.
They cause disease in animals and plants. Some of these pathogens are resistant to one or more antibiotics and are therefore difficult to treat. Microorganisms are problematic in other ways. For example they may be involved in the spoilage of foods. However, microorganisms can also be beneficial.