Webster's New World Medical Dictionary

tuberculosis, active
The presence of
Mycobacterium tuberculosis infection with a posi-
tive chest X-ray. Treatment of active tuberculosis
is mandatory by law in the US. See also 
DOT;
tuberculosis.
tuberculosis, antibiotic-resistant
A variant of
tuberculosis (TB) that is not affected by one or
more of the antibiotics normally used to treat it. If
the strain of TB is unaffected by more than one med-
ication, it is called multi-drug-resistant (MDR) TB.
Extensively drug-resistant tuberculosis (XDR TB) is
a rare type of MDR TB that is resistant to almost all
drugs used to treat TB. A person with any form of
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drug-resistant TB needs care from a specialist who
knows how to use stronger medications. These
forms of TB are particularly contagious. Family
members and other contacts of diagnosed patients
may also need to take medications as a preventive
measure.
tuberculosis, dormant
The presence of
Mycobacterium tuberculosis infection without a
positive chest X-ray. Treatment is not mandatory for
dormant tuberculosis (TB), as with active TB, but it
is a good idea because the bacterium could become
active later. Treatment involves a course of antibi-
otics and vitamins.
tuberculosis, extensively drug-resistant
A
rare type of multidrug-resistant tuberculosis (MDR-
TB) that is resistant to almost all drugs used to treat
tuberculosis (TB). Affected patients are left with
much less effective treatment options for this type of
TB. Abbreviated XDR-TB.
tuberculosis, extrapulmonary
TB that occurs
outside the lungs. For example, TB can be active in
the lymph nodes or kidneys.