Tuberculin sensitivity after BCG vaccination was studied in 86 children aged 6 to 24 months at W/o Beletshachew Abbajobire Mother and Child Health Centre, Addis Abeba from July 22-August 23, 1992. The overall conversion rate was 59%, of whom 75% showed indurations not exceeding 10mm. The study confirmed that the positive response in the Mantoux test due to BCG immunization usually produces less than 10mm of induration. Complications of BCG vaccine were observed in only one child (1.2%). Those children who did not react to the test positively (41%) were given re-vaccination with BCG. The study suggests that a Mantoux test should be the usual practice after BCG immunization.