Hepatitis D virus (HDV) is an example of a replication defective, helper dependent ssRNA virus because it requires Hepatitis B virus (HBV) to provide HBV surface antigen (HBsAg) for the encapsidation of its genome.
Hepatitis D virus (HDV) is a replication-deficient, helper-dependent RNA virus that needs Hepatitis B virus (HBV) to provide its surface antigen (HBsAg) for genome packaging.