[Verification of the safety, inoculability, reactogenicity and antigenic properties of a live recombinant smallpox-hepatitis B vaccine in an experiment in volunteers].

Trials of the first Soviet live recombinant smallpox-hepatitis B vaccine (SHBV) in volunteers (20 men aged 18-20 years) showed its safety, good "take"-rate, and lower reactogenicity as compared with the standard smallpox vaccine (LIVP strain). Smallpox virus-neutralizing antibodies in response to SHBV were produced as well as in response to the smallpox vaccine. Revaccination of human subjects with smallpox vaccine and SHBV 45 days after the previous vaccination resulted in antibody booster to vaccinia virus. After two inoculations of SHBV at an interval of 45 days no anti-HBsAg antibodies were found for 3 months after the last vaccination. However, even a single vaccination with SHBV induced priming to HBsAg. This could be demonstrated after inoculation of the subjects vaccinated with SHBV with one dose of plasma hepatitis vaccine. In the subjects vaccinated with SHBV antibody in response to the plasma vaccine formed more frequently and in higher titres than in those prevaccinated with smallpox vaccine or placebo.