In the preliminary report (Kekkaku, 25, 292, 1950), observations were made, for the period of 1.5 to 2.0 years after BCG vaccination done by scarification, on the changes in tuberculin allergy and local reactions of BCG by comparing them with those of the control groups injected intracutaneously with the vaccine of the same lot. In the present paper, the duration of tuberculin allergy of the above mentioned groups were followed for 4 years after vaccination.
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