A middle-aged man with poorly controlled diabetes develops a foot ulcer, which becomes infected with bacteria that are part of his normal skin flora. Which type of infection is this?
An endogenous infection from resident bacteria
Normal skin flora become harmful when they invade through broken skin, especially in an immunosuppressed host such as a poorly-controlled diabetic.
An infection caused by the patient’s own normal flora is called an endogenous infection, in contrast to exogenous infections acquired from outside sources.
Zoonotic infections come from animals, exogenous infections from hospital staff come from outside the body, and "exotic" is not a standard infection category.
Hence, An endogenous infection from resident bacteria.
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