Image from the Gallery: What is TB?
Recently, a new form of TB has emerged, called multidrug-resistant tuberculosis (MDR-TB). When bacteria are exposed to a medicine but not destroyed by it, they develop a resistance to that medicine. This is the case with MDR-TB, which is resistant to isoniazid and rifampicin, the two best anti-TB drugs. MDR-TB can often be cured, but only with extensive treatments of other medicines that are more expensive than isoniazid and rifampicin and have more adverse effects.