
Hepatitis D, also referred to as hepatitis D virus (HDV) and classified as Hepatitis delta virus, is a disease caused by a small circular enveloped RNA virus. It is one of five known hepatitis viruses: A, B, C, D, and E. HDV is considered to be a subviral satellite because it can propagate only in the presence of the hepatitis B virus (HBV). Trans...
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http://en.wikipedia.org/wiki/Hepatitis_D

<virology> A rare form of viral transfusion hepatitis. A defective viral agent that occurs only in association with hepatitis B infection. The delta agent may also increase the severity of hepatitis B infection. Complications include chronic persistent hepatitis and fulminant hepatitis. A test known as anti-delta agent antibody is positive an...
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infection with the hepatitis D virus, which can happen only after or at the same time as infection by hepatitis B virus; symptoms of this type are similar to those of hepatitis B, although the double infection is often more severe.
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Type: Term Synonyms: viral hepatitis type D
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http://www.medilexicon.com/medicaldictionary.php?t=40354

Hepatitis D: Liver inflammation due to the hepatitis D virus (HDV), which only causes disease in patients who already have the hepatitis B virus. Transmission is via infected blood, needles, or sexual contact with an infected person. Symptoms are identical to those of hepatitis B. Chronic infection with HDV is currently treated with interferon, alt...
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is a defective virus that needs the hepatitis B virus to exist. Hepatitis D virus (HDV) is found in the blood of persons infected with the virus.
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https://www.cdc.gov/vaccines/terms/glossary.html

a form of hepatitis that only causes symptoms when the individual is already infected with hepatitis B
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A virus transmitted by infected blood or blood products, or through unprotected sex with someone who is infected.
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https://www.futurelearn.com/info/courses/the-role-of-vaccines-in-preventing

a form of infectious hepatitis caused by the hepatitis (Delta) virus. This form of hepatitis can only occur in the presence of hepatitis B. Transmission of hepatitis D occurs the same way as hepatitis B.
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https://www.stanfordchildrens.org/en/topic/default?id=glossary---digestive-
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