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Microbiology
100
Consists of the harmless microorganisms that normally reside in many parts of the body but do not cause disease.
What is normal flora
200
Invasion of the body by pathogenic microorganisms.
What is infection
300
The interval of time between the invasion by a pathogenic microorganism and the appearance of the first symptoms of the disease.
What is incubation period
400
Microscopic single-celled organisms.
What is Bacteria
500
Smallest living organisms
What is Viruses