There is nice Article on Mycobacterium tuberculosis Types in Current Science, Volume 102, Issue 5, March 10 2012
TB is broadly divided into three categories: Multi-drug-resistant tuberculosis (MDR-TB), extensively drug-resistant tuberculosis (XDR-TB) and totally drugresistant tuberculosis (TDR-TB). MDRTB is resistant to the two most powerful first-line anti-TB drugs, isoniazidand rifampicin. XDR-TB is a form of TB caused by bacteria that are resistant to the most effective anti-TB drugs, or strains that have emerged from the mismanagement of MDR-TB. TDR-TB is a form of TB which is resistant to all currently used drugs. It was first discovered
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