viral hepatitis type D
Definition: acute or chronic hepatitis caused by a satellite virus, the hepatitis delta virus, a defective RNA virus requiring HBV for replication because it uses HBsAg as its own coat. The acute type occurs in two forms: 1) coinfection, the simultaneous occurrence of hepatitis B virus and hepatitis delta virus infections, which usually is self-limiting; 2) superinfection, the appearance of hepatitis delta virus infection in a hepatitis B virus carrier, which often leads to chronic hepatitis The chronic type appears to be more severe than other types of viral hepatitis.
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