Which situation is an example of a nonpathogenic microorganism becoming pathogenic?
A. A microorganism is harmless in its immature state but produces a toxin when the organism is mature.
B. A microorganism that is usually present in the colon and is nonpathogenic there causes disease when it is translocated into the blood.
C. A microorganism is present in one person but does not cause symptomatic disease (person is an asymptomatic carrier) but does cause disease when another person is infected by it.
D. A microorganism that is nonpathogenic is exposed to an antibiotic, which does not kill the microorganism but changes it, so that the microorganism is now re-sistant to the killing effects of the antibiotics.
B
Some microorganisms live and proliferate in certain body areas and do not produce infection or disease there; however, if the same microorganism is moved to another area, it can produce sig-nificant infection and disease. An example is Enterococcus, which is part of the normal intestinal flora and nonpathogenic in that location. If Enterococcus gets into the blood and overwhelms the immune response, sepsis and death can occur.
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