Causative agents
Hepatitis B virus (HBV) is one of the smallest enveloped double-stranded DNA virus that is part of the Hepadnaviridae family. The replication process of HBV that takes place in liver is unique among animal DNA viruses where herein, reverse transcription is involved. It destroys the liver and causes diseases such as cirrhosis and hepatocellular carcinoma. There are 8 distinctly classified genotypes of hepatitis B virus and further recognized subgenotypes. [1], [2]