VACCINATION WITH FREEZE-DRIED BCG

Abstract

Sixty first-year medical students, negative to 1:2000 and 1:100 dilutions of old tuberculin (OT), were vaccinated with freezedried BCG vaccine. At six months, 98.3% were found to be positive reactors as ascertained by the intracutaneous (Mantoux) method, using 1:2000 and 1:100 dilutions of OT, and 73.7% as ascertained by the Heaf test, using a tuberculin PPD solution containing 100,000 T.U. per ml.