The hepatitis D virus (also called delta virus) is a small circular RNA virus. The hepatitis D virus is replication defective and therefore cannot propagate in the absence of another virus. In humans, hepatitis D virus infection only occurs in the presence of hepatitis B infection.

History, clinical course, liver histology, diagnosis, prevention and treatment of hepatitis D.

Short article on hepatitis delta antigen and antibody (HDAg; anti-HD).