1. DNA Virus: Virus whose nucleic acid core is made up of DNA are called DNA virus. Virus DNA can be single-stranded or double-stranded.
Single-stranded DNA virus: ϕX174 and M13 coliphage virus of the family Parvoviridae.
Double-stranded DNA virus: vaccinia, variola, adenoherpes simplex, T2, TIV (Tipula Iridescent Virus) etc.
2. RNA Virus: Virus whose nucleic acid core is made up of RNA are called RNA virus. Viral RNA can be single-stranded or double-stranded.
Single-stranded RNA virus: Dengue, polio, mumps, TMV, HIV and rabies virus.
Double-stranded RNA virus: Virus of the family Reoviridae. Rio virus, rice dwarf virus, retro virus etc.