Baltimore classification:

Classification based on the way the virus generate their mRNA, type of nucleic acid (DNA/RNA, single-stranded/double-stranded, positive or negative sense)

Group I: Double-stranded DNA virus (DS-DNA) 

  • Polyomavirus – BK, JC, KI, WU, Merkel cell polyoma virus.
  • Papillomavirus – HPV.
  • Adenovirus
  • Herpes virus – HSV, VZV, EBV, CMV, HHV6, HHV7, HHV8.
  • Poxvirus – Variola, vaccinia, Molluscum contagiosum, Tanapox, Yaba monkey tumour virus.

Group II: Single-stranded DNA virus (SS-DNA) –

  • Parvoviruses – Parvovirus B19, Human Parvovirus 4, Human Bocavirus, Adeno-associated virus 2,3,5
  • Circovirus
  • Anellovirus

Most ssDNA virus have (+) sense DNA, except family Anelloviridae. 

Group III: Double-Stranded RNA virus (DS-RNA)-

  • Birnavirus (animal virus)
  • Reovirus – Reovirus, Rotavirus

Group IV: Single-stranded positive-sense RNA virus (+ssRNA) –

  • Picornaviridae – Enterovirus (Enterovirus, Coxsackievirus, Echovirus, Poliovirus), Rhinovirus, Parechovirus, Hepatitis A virus.
  • Caliciviridae – Norovirus, Norwalk virus, Sapovirus.
  • Astroviridae – Human astrovirus
  • Hepeviridae – Hepatitis E virus
  • Flaviviridae – Yellow fever, Dengue, West Nile, JE, St. Louis encephalitis virus, KFD,  Tick-borne encephalitis virus, Hepatitis C virus, Hepatitis G virus.
  • Togaviridae – Semliki forest, Chikungunya virus, O’nyong-nyong virus, Ross River virus, Rubella virus.
  • Arteriviridae (animal virus)
  • Coronaviridae – Human coronavirus(HCoV) 299E, HCoV NL63, HCoV OC43, HCoV HKU1, SARS CoV, SARS CoV-2, MERS CoV.

Group V: Single-stranded negative-sense RNA virus (-ssRNA) –

Non-segmented RNA:

  • Rhabdovirus – Lyssavirus (Rabies)
  • Bornavirus (animal virus)
  • Paramyxovirus – Human parainfluenzavirus, Mumps, Measle, Hendra, Nipah, RSV, human metapneumovirus.
  • Filovirus – Ebola, Marburgvirus

Segmented RNA:

  • Arenavirus – LCMV, Lassa, Lujo, Junin, Machupo, Guanarito, Chapare, Tacaribe, Sabia.
  • Bunyavirus – Sandfly fever virus, Rift valley fever virus, California encephalitis virus, Crimean–Congo haemorrhagic fever, hantaan virus, Sin Nombre virus.
  • Orthomyxovirus – Influenza virus

Category VI: Positive sense single-stranded RNA virus replicating through a DNA intermediate – reverse transcriptase (+ssRNA-RT) –

  • Retrovirus

Category VII: Double-stranded DNA virus replicating through an ssRNA intermediate – reverse transcriptase (dsDNA-RT) –

  • Hepadnavirus
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