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Relationship between the amount of time required for a Bactec MGIT 960 positive result and the load of AFB in sputum samples. Smear grade: 3+, >10 AFB/field in at least 20 oil fields of smear; 2+, 1 to 9 AFB/field in at least 50 fields; 1+, 10 to 99 AFB in 100 fields; scant+, <10 AFB in 100 fields. For smears classified as negative, no AFB were seen in the entire smear.
