%0 Journal Article %A H.J. Kim %A S.Y. Oh %A J.B. Lee %A E.P. Lee %A E.H. Cho %T Nationwide school-based tuberculin survey with effect of BCG vaccination %D 2013 %J European Respiratory Journal %P P2848 %V 42 %N Suppl 57 %X Backgrounds: Nationwide tuberculin survey to the 1st (E1), 6th graders (E6) of the elementary schools and 1st graders (H1) of the senior high schools in 2012.Objectives: To identify the effect of mass BCG vaccination on school-based tuberculin surveyMethod: Tuberculin survey was conducted to three school graders selected by a population-based proportional allocation using stratified random sampling. A total of 28,724 students were tuberculin tested with 2 TU PPD RT23 with Tween 80. The maximum transverse diameter of induration was measured after 72 hours. TBI (defined as an induration size ≥10 mm) rate was compared by the presence of BCG scars and vaccination method.Results: The numbers of participated students were 7,872 in E1, 10,451 in E6 and 10,401 in H1 group. The proportion of students with BCG scar(s) was decreased from 91.4% in E1, to 76.8% in H1. TBI rate of the students with BCG scar(s) was 8.2% (95%CI; 7.6-8.9) in E1, 8.3% (95%CI; 7.7-8.9) in E6, and 9.6% (95%CI; 8.9-10.3) in H1 group. It was decreased to 3.7% (95%CI; 2.3-5.2), 4.9% (95%CI; 3.9-5.9), and 8.6% (95%CI; 7.4-10.0) among students without BCG scars in each. TBI rate was 5.9% (95%CI; 4.9-6.9) in E1, 6.1% (95%CI; 5.4-6.8) in E6, and 8.5% (95%CI; 7.7-9.3) in H1 group among students with intradermal vaccination. It was 8.3% (95%CI; 7.5-9.0) in E1, 8.8% (95%CI; 8.0-9.6) in E6, and 10.9% (95%CI; 9.6-12.4) in H1 group among students with multipuncture vaccination. TBI rate of the students with multipuncure vaccination was significantly high in all three groups.Conclusion: BCG vaccination still affects tuberculin response up to the 1st graders of the senior high school. %U https://erj.ersjournals.com/content/erj/42/Suppl_57/P2848.full.pdf