- Group I: viruses possess double-stranded DNA and include such virus families as Herpesviridae (examples like HSV1 (oral herpes), HSV2 (genital herpes), VZV (chickenpox), EBV (Epstein-Barr virus), CMV (Cytomegalovirus)), Poxviridae (smallpox) and many tailed bacteriophages. The mimivirus was also placed into this group.
- Group II: viruses possess single-stranded DNA and include such virus families as Parvoviridae and the important bacteriophage M13.
|Virus Family||Virus Genus||Virion- naked/ enveloped||Capsid Symmetry||Type of nucleic acid|
|3.Parvoviridae||B 19 virus||Naked||Icosahedral||ss|
|4.Herpesviridae||Herpes Simplex Virus, Varicella zoster virus, Cytomegalovirus, Epstein Barr virus||Enveloped||Icosahedral||ds|
|5.Poxviridae||Small pox virus, Vaccinia virus||Complex coats||Complex||ds|
|6.Hepadnaviridae||Hepatitis B virus||Enveloped||Icosahedral||ds circular|
|7.Polyomaviridae||Polyoma virus (progressive multifocal leucoencephalopathy)||?||?||ds|
 RNA viruses
- For more details on this topic, see RNA virus.
- Group III: viruses possess double-stranded RNA genomes, e.g. rotavirus. These genomes are always segmented.
- Group IV: viruses possess positive-sense single-stranded RNA genomes. Many well known viruses are found in this group, including the picornaviruses (which is a family of viruses that includes well-known viruses like Hepatitis A virus, enteroviruses, rhinoviruses, poliovirus, and foot-and-mouth virus), SARS virus, hepatitis C virus, yellow fever virus, and rubella virus.
- Group V: viruses possess negative-sense single-stranded RNA genomes. The deadly Ebola and Marburg viruses are well known members of this group, along with influenza virus, measles, mumps and rabies.
 Reverse transcribing viruses
- For more details on this topic, see Reverse transcribing virus.
- Group VI: viruses possess single-stranded RNA genomes and replicate using reverse transcriptase. The retroviruses are included in this group, of which HIV is a member.
- Group VII: viruses possess double-stranded DNA genomes and replicate using reverse transcriptase. The hepatitis B virus can be found in this group.