As per RNTCP guidelines, Multi drug resistance (MDR) TB is defined as resistance to:: (A) Rifampicin, (B) Rifampicin and isoniazide, (C) Rifampicin, isoniazide and ethambutol, (D) None of the above
Answer is B. Confirmed MDR-TB case: MDR-TB suspect is one who is sputum culture positive and whose TB is due to Mycobacterium tuberculosis that are resistant in-vitro to at least isoniazid and rifampicin (the culture and DST result being from an RNTCP accredited laboratory). Ref: Park 21st edition, page 178.