Viruses have been traditionally named by adding the word 'virus' after the disease caused in the major host, e.g. poliovirus, the causative agent of poliomyelitis.
Bacteriophages were named after laboratory code symbols e,g. φX174, P22, T7 etc.
Holmes (1948) followed the Linnaen system of binomial nomenclature. Viruses were grouped under the order Virales, which was divided into three suborders:
Phaginae - infecting bacteria.
Phytophaginae - infecting plants.
Zoophaginae - infecting animals.
Classification of Virus by Casjens and King
Bacteriophages were named after laboratory code symbols e,g. φX174, P22, T7 etc.
Holmes (1948) followed the Linnaen system of binomial nomenclature. Viruses were grouped under the order Virales, which was divided into three suborders:
Phaginae - infecting bacteria.
Phytophaginae - infecting plants.
Zoophaginae - infecting animals.
Classification of Virus by Casjens and King
The Major groups of virus according to the type of nucleic acid, symmetry presence or absence of an envelope and site of assembly.
I.ssRNA VIRUSES
(A) HELICAL
a.Rigid rods :
Tobacco mosaic virus
Barely stripe mosaic virus
Tobacco rattle virus
(A) HELICAL
a.Rigid rods :
Tobacco mosaic virus
Barely stripe mosaic virus
Tobacco rattle virus
b. Flexous rods :
Potato X and Y viruses
Clover yellow mosaic virus.
Potato X and Y viruses
Clover yellow mosaic virus.
(B) ICOSAHEDRAL
a.Spherical plant viruses
(i) With 180 identical capsomers (T=3)
Cowpoa chlorotic mosaic virus
Cumumber mosaic virus
Turnip yellow moasic virus
(ii)With 60 subunits of 2 structural proteins (T=1) :
Cowpa moasic virus
Cowpa moasic virus
b. Bacteriophages : R17, fr, f2, MS2,Q
c. Picornaviruses : (animal) -4 sub groups
(i) Human enteroviruses.Poliovirus, coxsackie and ECHO viruses
(ii) Rodent cardioviruses.Encephalomyocaritis virus, Mouse Elberfield virus, Mengovirus
(iii) Rhinoviruses. : Human respiratory infection
(iv) Foot - and mouth disease virus.
(i) Human enteroviruses.Poliovirus, coxsackie and ECHO viruses
(ii) Rodent cardioviruses.Encephalomyocaritis virus, Mouse Elberfield virus, Mengovirus
(iii) Rhinoviruses. : Human respiratory infection
(iv) Foot - and mouth disease virus.
(C) ENVELOPED
(i) Spherical : Togavirus -Yellow fever
(ii) Bullet Shaped :Rhabdovirus - rabies
(iii) Spherical or filamentous : Paramyxovirus -measles Myxovirus - influenza
(iv) spherical : Coronavirus -actute upper respiratory tract infections
(i) Spherical : Togavirus -Yellow fever
(ii) Bullet Shaped :Rhabdovirus - rabies
(iii) Spherical or filamentous : Paramyxovirus -measles Myxovirus - influenza
(iv) spherical : Coronavirus -actute upper respiratory tract infections
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