Definite TB | 1. One or more sputum cultures positive for Mycobacterium tuberculosis (MTB) with ≥ 10 colony forming units (CFU); or, |
2. Two or more sputum cultures with 1–9 CFU of MTB (indeterminate MTB culture); or, | |
3. Two or more positive sputum smears for acid fast bacilli (AFB) *; or, | |
4. One or more cultures for MTB from the blood or other sterile body site. | |
Probable TB | 1. Positive chest x-ray plus either |
a. one positive sputum AFB smear, or, | |
b. one indeterminate MTB culture result; or, | |
2. Clinical symptoms/signs plus either | |
a. one positive sputum AFB smear, or, | |
b. an indeterminate MTB culture result; or, | |
3. Clinical symptoms/signs and a positive x-ray plus a response to anti-TB therapy; or, | |
4. One positive sputum AFB smear from a sterile site plus clinical symptoms/signs of tuberculosis; or, | |
5. Caseous necrosis on a tissue biopsy. |