Immunogenicity of yeast-derived hepatitis B vaccine in Pakistani adults.

A study of the immunogenicity and safety of 20 micrograms recombinant DNA yeast derived hepatitis B vaccine was conducted in 153 Pakistani adults. All participants were in good physical condition, had negative hepatitis B serological markers (HBsAg, anti-HBs, anti-HBc) and normal ALT. Anti-HBs developed in 33%, 81% and 98% of subjects one month after the first, second and third dose respectively. Minor systemic and local side-effects were observed in 39% of individuals. We conclude that yeast derived hepatitis B vaccine is safe, effective and immunogenic in Pakistani adults.