Table 4. Results of screening in February 2009 and April 2010 of students in the same classroom as index case (Zhejiang Province, China, 2009–2010).
| Screening result in February 2009 |
No. screened |
Screening result in April 2010 | ||||
| No. of Cases | Infection Rate (%) | |||||
| Probable/Confirmed TB | Latent TB Infection (TST ≥15 mm) |
Probable/Confirmed TB | Latent TB Infection (TST ≥15 mm) |
|||
| TST-positive (≥15 mm) |
Student | 22 | 11 | 9 | 50 | 41 |
| Teacher | 5 | 0 | 3 | 0 | 60 | |
| TST-negative (<15 mm) |
Student | 17 | 4 | 9 | 24 | 53 |
| Teacher | 4 | 0 | 1 | 0 | 25 | |
Abbreviations: TST, tuberculin skin testing; TB, tuberculosis.