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Classified as either Primary pathogens or as
Opportunistic pathogens according to the status of host defenses
Primary pathogens cause disease as a result of their presence or
activity within the normal, healthy host, and their intrinsic virulence
Opportunistic pathogens Organisms which cause an infectious disease in a
host with depressed resistance
Opportunistic disease may be caused by microbes that are ordinarily in
contact with the host, such as bacteria or fungi in the gastrointestinal
or the upper respiratory tract
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