Hepatitis D is a type of viral hepatitis caused by the hepatitis delta virus (HDV), a small spherical enveloped particle that shares similarities with both a viroid and virusoid. HDV is one of five known hepatitis viruses: A, B, C, D, and E. HDV is considered to be a satellite (a type of subviral agent) because it can propagate only in the presence of the hepatitis B virus (HBV). Transmission of HDV can occur either via simultaneous infection with HBV (coinfection) or superimposed on chronic hepatitis ...
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