Table 4. Demographic data of the five incident active TB cases.

Case	1	2	3	4	5
IPT	No	No	No	No	Yes
Age (years old)	42.5	42.6	31.8	81.7	26.3
Gender	Male	Male	Male	Male	Male
HIV transmission risk category	IDU	MSM	MSM	Heterosexual contact	MSM
History of TB contact	No	No	Yes	No	No
Prison stay	Yes	Yes	No	No	No
TST size(mm) at enrollment	18	20	16	15	20
CD4+ lymphocyte count at enrollment/TB diagnosis	435/243	130/189	319/314	487/259	578/423
On ART at enrollment/TB diagnosis	No/No	No/Yes	No/No	Yes/Yes	No/No
Interval between enrollment and TB diagnosis (days)	1133	745	360	201	807
TB location	Pulmonary	Pulmonary	Pulmonary	Pulmonary	Pulmonary

Definition of abbreviations: IPT = isoniazid preventive therapy; MSM = man who had sex with man; IDU = injection drug use; TST =  tuberculin skin test; ART = highly active antiretroviral therapy.