It is the study of organisms too small to be seen by the naked eyes.
Microbiology
The branch of microbiology that focuses on the study of the simplest and most primitive form of animal life also known as protozoans.
Protozoology
It is the study of fungi such as yeast and mold
Mycology
The study of bacteria
Bacteriology
A branch of microbiology that focuses on the study of “rickettsiae”, the transitional organisms between bacteria and viruses
Rickettsiology
The branch of microbiology that studies acellular entity that contains either a DNA or RNA but never both and uses the cellular machinery of living organisms to survive.
Virology