Hepatitis B is the most important infectious occupational disease for the health care workers. This book presents the detailed review of literature regarding the hepatitis B virus, implications for dental health care workers, vaccines and vaccination schedules. The book emphasizes about hepatitis B vaccination and monitoring of post vaccination immunity status. In this book we have also discussed about the factors responsible for the low anti –HBS titre. This book would serve as a useful reference for health care professionals regarding hepatitis B immunization.