Abassi, A. Mansourian, A.R. 2007 We carried out a follow up cohort study of 260 smear positive patients 178 on directly observed treatment, short course DOTS 82 on non DOTS over a 2 year period to evaluate the efficacy of the DOTS strategy in treatment of tuberculosis TB . All the patients had cough for 3 weeks 91.9 had fever, 60.8 of them with sputum and 27.7 had a positive family history. The rate of treatment failure with DOTS was 9.0 at the end of the 2nd month and 1.7 at the beginning of the 5th month. In the control group these rates were 18.3 and 7.3 ...