Hepatitis B virus (HBV) is one of the most common viruses in the modern world and ranked by the WHO as one of the top ten killers. It is responsible for approximately 1.5 million deaths worldwide each year, two thirds of which are attributable to primary hepatic carcinoma following HBV infection. Hepatitis B is preventable with a safe and effective vaccine, the first vaccine against cancer due to HBV infection. The prevalence of HBV infection varies from country to country and depends upon a complex mixture of behavioral, environmental and host factors. The knowledge of the prevalence of...