<prompt> HBV and HDV false is -Both can infect simultaneouslyHDV causes more serious infection dt superinfectionHDV cannot infect in absence of HBVDNA viruses  <response>: HBV is a DNA virus HDV is an RNA virus.HDVHBV is co-infection HIV causes more serious infection due to superinfection REF:MICROBIOLOGY ANANTHA NARAYANAN NINTH EDITION PAGE.549 