Hepatitis B is a contagious liver infection caused by the hepatitis B virus (HBV). Hepatitis B is transmitted when blood, semen, or another body fluid from an infected person enters the body of an uninfected person. This can happen through sexual contact; sharing razors, toothbrushes, needles, syringes, or from mother to baby at birth. The best way to prevent hepatitis B is by getting vaccinated.
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