Final answer:
Hepatitis D Virus (HDV) is the subvirus satellite infection requiring HBsAg of HBV for replication; HDV can propagate only in the presence of HBV. Vaccination against HBV offers protection against HDV as well.
Step-by-step explanation:
The type of hepatitis that is described as a unique subvirus satellite virus infection and requires the HBsAg of Hepatitis B Virus (HBV) for replication is Hepatitis D (HDV). HDV is an enveloped ssRNA(-) circular virus, and it relies on the presence of HBV to propagate. HDV is transmitted through contact with infected blood and is uncommon in the United States, only occurring in individuals who are already infected with HBV.
Vaccination against HBV is also protective against HDV infection. The Hepatitis B vaccine is derived from a segment of the virus surface antigen and produced using recombinant DNA technology in yeast cells.