Mycobacterium tuberculosis can cause tuberculosis, a life-threatening lung infection, but can also infect an individual asymptomatically for years. It is not considered to be part of the normal flora, and can infect healthy individuals upon exposure. It can only replicate in the host and thus mainly spreads by direct human contact. Mycobacterium tuberculosis is therefore …
A) a facultative primary pathogen.
B) a facultative opportunistic pathogen.
C) an obligate primary pathogen.
D) an obligate opportunistic pathogen.
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