Copies of author's previously published articles contained in back cover pocket. / Bibliography: leaves 129-152. / xiv, 152, [60] leaves, [28] leaves of plates : ill. (some col.) (some folded) ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Examines hepadravirus and HDV replication and gene expression with particular emphasis on the block(s) preventing HBV infection invitro, the extent of the helper function provided by HDV by HBV and the mechanism of HDV RNA replication. / Thesis (Ph.D.)--University of Adelaide, Depts. of Microbiology and Immunology, 1992