Virus Classification - LHT System of Virus Classification

LHT System of Virus Classification

The LHT System of Virus Classification is based on chemical and physical characters like nucleic acid (DNA or RNA), Symmetry (Helical or Icosahedral or Complex), presence of envelope, diameter of capsid, number of capsomers. This classification was approved by the Provisional Committee on Nomenclature of Virus (PNVC) of the International Association of Microbiological Societies (1962). It is as follows:

• Phylum Vira (divided into 2 subphyla)

• Subphylum Deoxyvira (DNA viruses)

• Class Deoxybinala (dual symmetry)

• Order Urovirales

• Family Phagoviridae

• Class Deoxyhelica (Helical symmetry)

• Order Chitovirales

• Family Poxviridae

• Class Deoxycubica (cubical symmetry)

• Order Peplovirales

• Family Herpesviridae (162 capsomeres)

• Order Haplovirales (no envelope)

• Family Iridoviridae (812 capsomeres)
• Family Adenoviridae (252 capsomeres)
• Family Papiloviridae (72 capsomeres)
• Family Paroviridae (32 capsomeres)
• Family Microviridae (12 capsomeres)

• Subphylum Ribovira (RNA viruses)

• Class Ribocubica

• Order Togovirales

• Family Arboviridae

• Order Lymovirales

• Family Napoviridae
• Family Reoviridae

• Class Ribohelica

• Order Sagovirales

• Family Stomataviridae
• Family Paramyxoviridae
• Family Myxoviridae

• Order Rhabdovirales

• Suborder Flexiviridales

• Family Mesoviridae
• Family Peptoviridae

• Suborder Rigidovirales

• Family Pachyviridae
• Family Protoviridae
• Family Polichoviridae