MDRTB must be treated for at least-
**Core Concept**
MDR-TB (Multidrug-Resistant Tuberculosis) is a form of TB that is resistant to at least two of the most powerful TB drugs, isoniazid and rifampicin. Effective treatment of MDR-TB requires a combination of second-line antibiotics to prevent the development of further resistance.
**Why the Correct Answer is Right**
MDR-TB treatment must be prolonged to ensure that the bacteria are fully cleared from the body. The World Health Organization recommends a minimum duration of 20 months for MDR-TB treatment. This prolonged treatment period is necessary to prevent the emergence of further resistance and to ensure that the infection is fully cured.
* The 20-month duration allows for the gradual reduction of bacterial load and the prevention of further resistance development.
* This extended treatment period also gives the body sufficient time to recover from the infection and rebuild its immune system.
**Why Each Wrong Option is Incorrect**
**Option A:** 6 months - This is the standard treatment duration for drug-susceptible TB, not MDR-TB. MDR-TB requires a longer treatment duration to prevent the emergence of further resistance.
**Option B:** 12 months - While this may seem like a reasonable duration, it is still too short for MDR-TB treatment. The prolonged treatment period of 20 months is necessary to ensure that the infection is fully cleared and to prevent further resistance development.
**Option C:** 24 months - While this is closer to the correct answer, it is still not the minimum recommended duration for MDR-TB treatment. The World Health Organization recommends a minimum of 20 months for MDR-TB treatment.
**Clinical Pearl / High-Yield Fact**
The treatment of MDR-TB requires a combination of second-line antibiotics, including fluoroquinolones, aminoglycosides, and thioamides. These medications must be used in combination to prevent the development of further resistance and to ensure that the infection is fully cleared.
**Correct Answer: B. 20 months.**