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There is a paucity of published data on the effect of tuberculosis (TB) chemotherapy on nitric oxide (NO) synthesis and metabolism in newly diagnosed and relapsed patients with or without multidrug-resistant TB (MDR-TB).The pattern of NO response in 140 patients with pulmonary TB, including 74 with MDR-TB (1st group) and 66 without MDR-TB (2nd group) has been studied and compared with the NO status...