The hepatitis B virus is a hepatotropic agent belongs to the hepadnaviridae
family. He is responsible for 350 million infections worldwide and is estimated two
billion people have been infected. However, after implementation of universal HBV
vaccination in infants occurred to decrease prevalence in many parts of the world.
Their transmission occurs by cuts in skin and mucosa, unprotected sex and
parenterally, sharing needles and syringes, tattoos, piercings, dental or surgical
procedures.
Keywords: Epidemiology, Hepatitis B virus, HBV vaccination, HBsAg, Occult
hepatitis B.
