Treatment of susceptible tb
All isolates of Mycobacterium tuberculosis should be tested for antimicrobial susceptibility, but results generally do not become available for at least 2 weeks and sometimes much longer (GL Woods, Infect Dis Clin North Am 2002; 16:127). Standard therapy for TB includes a 2-month initial phase of treatment and a continuation phase of either 4 or 7 months, depending on the results of sputum cultures at 2 months. Among the drugs used for treatment of TB, effectiveness is best documented for regimens containing isoniazid and rifampin.