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SOME EFFECTS OF RUBELLA VACCINATION ON IMMUNOLOGIC RESPONSIVENESS 1

Some viral diseases such as measles, chicken pox and rubella, are known to depress cutaneous delayed hypersensitivity to tuberculin (2, 5, 14) and the same effect has been observed after administration of live viral vaccines (3, 7, 8). Recently it was also demonstrated that during measles, viral hepatitis, and after vaccination against measles, there occurs a depression of blast transformation of lymphocytes cultivated in vitro in the presence of phytohaemagglutinin (PHA). Such lymphocytes cannot be activated by tuberculin (6, 7, 9). It would appear that these effects depend on a temporary impairment of lymphocyte functions, possibly triggered by the virus (1 1). Lymphocytes from infants with congenital rubella were demonstrated to lack the property of being activated by PHA (11, 12). During a trial with rubelha vaccine (4), we have studied its effect, on the tuberculin reaction, on the peripheral leukocytes, and on the blast tran5formation of lymphocytes of the vaccinees.