Table 1.

Breakdown of patient classes recruited for this study.

Condition	No. of samples	Age range (yrs)	Gender male (M), female (F)	Clinical summary
Active TB	19	18–52	11M, 8F	All 19 cases are sputum smear positive with grade 2 to 3. Chest X-ray is abnormal in all, 13 with bilateral and 6 with unilateral abnormality, with 1 to 6 zones, 6 show cavities and 13 show no cavities. Almost all patients show normal hematology
HC	15	30–60	8M, 7F	All are sputum smear negative, chest X-rays appear normal, no clinical symptoms of TB and no known prior history of TB
LTB IGRA + ve	13	19–34	11M, 2F	All are sputum smear negative, chest X-rays appear normal, no clinical symptoms of TB and no known prior history of TB

Condition	No. of samples	Age range (yrs)	Gender	CD4 cells/mm	Viral load copies/ml	Clinical summary
HIV	7	25–47	4M, 3F	16–28%; mean: 20.5% (not investigated in 2)	3.4 × 101 to 8.2 × 104	All patients are treatment-naive and show normal chest X-rays with no evidence of TB