Presumptive TB patients, >=18 years old. This study will analyze 500 subjects bacteriologically confirmed TB (250 new cases and 250 previously treated cases). To obtain the numbers, we estimate to enroll 1357 subjects presumptive TB (1000 new cases and 357 previously treated cases). These numbers are made based on our estimation that 25% of presumptive new TB cases and 70% of presumptive previously treated TB cases will be bacteriologically confirmed.