卡介苗
According to the Ohio Department of Health and US Department of Health, the Bacillus Calmette–Guérin (BCG) vaccine does not protect against TB infection. It does, though, give 80% of children protection against tuberculous meningitis and miliary tuberculosis. Therefore, a positive TST/PPD in a person who has received BCG vaccine is interpreted as latent TB infection (LTBI).