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In some people, the hepatitis B virus can also cause a chronic liver infection that can later develop into cirrhosis of the liver or liver cancer. More than 90% of healthy adults who are infected with the hepatitis B virus will recover naturally from the virus within the first year. The virus is transmitted through contact with the blood or other body fluids of an infected person. 2  An estimated 240 million people are chronically infected with hepatitis B (defined as hepatitis B surface antigen positive for at least 6 months).
The name of each type of viral hepatitis condition corresponds to the virus that causes it. For example, hepatitis A is caused by hepatitis A virus (HAV), hepatitis B is caused by hepatitis B virus (HBV), and hepatitis C is caused by hepatitis C virus (HCV). Scientists do not know exactly how these viruses actually cause hepatitis.