Criteria A:

・ All failures of new TB cases

・ Smear positive previously treated cases who remain smear positive at 4^th month onwards

・ All pulmonary TB cases who are contacts of known MDR TB case

Criteria B: in addition to Criteria A:

・ All smear positive previously treated pulmonary TB cases at diagnosis

・ Any smear positive follow up result in new or previously treated cases

Criteria C: in addition to Criteria B

・ All smear negative previously treated pulmonary TB cases at diagnosis,

・ HIV TB co-infected cases at diagnosis