Table 1.
General information of 32 close contacts of the index active TB case.
| Case No. | Age (years) | Gender | Residence area | Exposure levela | Suspicious symptoms of TB | BCG scar | Size of PPD (mm × mm) | Judgment of PPD result | Latent of TB | IGRA | Chest CT | Preventive therapyc |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 33 | Male | Rural | 2 | No | Yes | 17 × 17 | +++ | + | + | − | Yes |
| 2b | 24 | Male | Rural | 1 | No | Yes | 5 × 5 | + | − | − | − | No |
| 3 | 21 | Male | Urban | 2 | No | Yes | 5 × 6 | + | − | − | − | No |
| 4 | 26 | Male | Rural | 2 | No | Yes | 5 × 5 | + | − | − | − | No |
| 5 | 26 | Male | Rural | 2 | No | No | 12 × 13 | ++ | + | − | − | No |
| 6b | 24 | Male | Urban | 1 | No | Yes | 5 × 5 | + | − | − | − | No |
| 7 | 20 | Male | Urban | 1 | No | No | 15 × 16 | +++ | + | + | − | Yes |
| 8 | 23 | Male | Rural | 2 | No | Yes | 0 × 0 | − | − | − | − | No |
| 9 | 20 | Male | Rural | 1 | No | Yes | 0 × 0 | − | − | − | − | No |
| 10 | 28 | Male | Urban | 2 | No | No | 0 × 0 | − | − | − | − | No |
| 11 | 24 | Male | Urban | 2 | No | Yes | 0 × 0 | − | − | − | − | No |
| 12b | 21 | Male | Urban | 1 | No | No | 0 × 0 | − | − | − | − | No |
| 13b | 21 | Male | Rural | 1 | No | No | 0 × 0 | − | − | − | − | No |
| 14 | 26 | Male | Urban | 2 | No | Yes | 11 × 12 | ++ | + | − | − | No |
| 15b | 23 | Male | Rural | 1 | No | Yes | 0 × 0 | − | − | − | − | No |
| 16 | 23 | Male | Rural | 2 | No | Yes | 13 × 14 | ++ | + | − | − | No |
| 17 | 20 | Male | Urban | 2 | No | Yes | 8 × 8 | + | − | − | − | No |
| 18 | 26 | Male | Rural | 2 | No | No | 0 × 0 | − | − | − | − | No |
| 19 | 28 | Male | Urban | 2 | No | No | 0 × 0 | − | − | − | − | No |
| 20 | 35 | Male | Urban | 2 | No | Yes | 0 × 0 | − | − | − | − | No |
| 21 | 29 | Male | Urban | 2 | No | Yes | 5 × 5 | + | − | − | − | No |
| 22 | 25 | Male | Rural | 2 | No | Yes | 7 × 7 | + | − | + | − | No |
| 23 | 35 | Male | Urban | 2 | No | Yes | 0 × 0 | _ | − | − | − | No |
| 24 | 21 | Male | Rural | 2 | No | Yes | 18 × 20 | +++ | + | − | − | Refuse |
| 25 | 33 | Male | Rural | 2 | No | Yes | 17 × 18 | +++ | + | − | − | Refuse |
| 26 | 21 | Male | Rural | 2 | No | Yes | 17 × 17 | +++ | + | − | − | Refuse |
| 27 | 31 | Male | Urban | 2 | No | Yes | 15 × 16 | +++ | + | − | − | Refuse |
| 28 | 35 | Male | Urban | 2 | No | Yes | 17 × 17 | +++ | + | − | − | Refuse |
| 29 | 33 | Male | Urban | 2 | No | Yes | 15 × 15 | +++ | + | − | − | Refuse |
| 30 | 31 | Male | Urban | 2 | No | Yes | 20 × 20 | +++ | + | − | − | Refuse |
| 31 | 30 | Male | Urban | 2 | No | Yes | 19 × 19 | +++ | + | − | − | Yes |
| 32 | 35 | Male | Rural | 2 | No | Yes | 15 × 15 | +++ | + | − | − | Refuse |
Individuals in exposure level 1 are close contacts living in the same room with the index case or good friends of the index case, and individuals in exposure level 2 are close contacts who attended classes in the same classroom with the index case.
Close contacts developed active TB after 3 months.
Yes, the current evidence supports preventive anti-tuberculosis treatment for close contact and the close contact agreed and received preventive therapy; Refuse, the current evidence supports preventive anti-tuberculosis treatment for close contacts but the close contact did not consent to prophylactic treatment; No, the current evidence does not support preventive anti-tuberculosis treatment for close contact and the close contacts did not receive preventive therapy.