Hepatitis D: Liver inflammation due to the hepatitis D virus (HDV), which causes disease only in patients who additionally have the hepatitis B virus. Transmission occurs via infected blood, needles, or sexual contact with an infected person. Symptoms are identical to those of hepatitis B. HDV infection can be prevented with the hepatitis B vaccine and through avoidance of activities that could lead to getting the virus.
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Last Editorial Review: 1/24/2017