Microorganisms exist in: water, in soil, and on body surfaces such as skin, intestinal tract, and other areas open to the outside ( e.g.. mouth, upper respiratory tract, vagina, and lower urinary tract).
What is the term that explains most microorganisms that are harmless, and beneficial and perform essential body functions?
What is Resident Flora?
normal microorganisms that are residents of a particular part of the body. An example, Escherichia coli (E. coli) is a normal inhabitant of the large intestine but a common cause of infection of the urinary tracy.
What is an Infection?
an infection is an invasion of body tissue by microorganisms and their growth there.
What is an infectious agent?
Asymptomatic or subclinical
If the microorganism produces no clinical evidence of disease