Hepatitis is inflammation of the liver. Hepatitis B is hepatitis caused by the hepatitis B virus.
Hepatitis B virus spreads through contact with infected blood. Specifically, hepatitis B may be spread through:
Direct contact with the blood of an infected person
Unprotected sexual activity with an infected person
Needle sharing among intravenous drug users
Sharing razors or other personal items with an infected person
Being pierced or tattooed with contaminated instruments
Blood transfusions (extremely rare in the United States because of improved testing)
Childbirth, when the virus is passed from mother to child
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