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The epidemiology of hepatitis D occurs worldwide. Although the figures are disputed, a recent systematic review suggests that up to 60 million individuals could be infected. The major victims are the carriers of the hepatitis B surface antigen , who become superinfected by the HDV, and intravenous drug users who are the group at highest risk. The infection usually results in liver damage ; this is most often a chronic and severe hepatitis rapidly conducive to cirrhosis.
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