An Infectious Agent Already Existing on or in the Body

Question

An infectious agent already existing on or in the body is called ________.
A)exogenous
B)an exotoxin
C)an enterotoxin
D)endogenous
E)axenic

Accepted Answer

Endogenous means originating from within the body, so an infectious agent that already exists on or in the body would be considered endogenous.