| interpretation of the tuberculin skin test in mycobacterium bovis bcg-vaccinated singaporean schoolchildren. | tuberculin skin test (tst) interpretation in singapore is confounded by universal bcg vaccination at birth and by a revaccination policy for schoolchildren who are tuberculin nonreactors (tst < 10 mm, using 1 tu ppd rt 23) at 12 or 16 yr old, with not more than two bcg vaccinations given to any child. school health records for birth cohorts 1978 to 1984 indicate that 82.8% were revaccinated at age 12 yr. by collation with the national database of tuberculosis (tb) notifications, we examined the ... | 2001 | 11587978 |