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Viral hepatitis is an infection that affects the liver. While there are at least five different types of hepatitis (A-E), the three most common types in the United States are hepatitis A, hepatitis B and hepatitis C.
Hepatitis A is an acute infection and people usually improve without treatment. Hepatitis B and hepatitis C can cause chronic, persistent infections, which can lead to chronic liver disease. There are vaccines to prevent hepatitis A and hepatitis B; however there is no vaccine for hepatitis C.