Classification of Classification is by two ways: 1. By structure of nucleic acid 2. By size, envelope, capsid shape Tobacco mosaic virus : 1 st discovered in history

DNA VIRUSE S 1. 3 non-enveloped families: * Papovaviruses, * Adenoviruses * Parvoviruses, 2. 3 enveloped families : a) Hepadnaviruses b) Herpesviruses c) Poxviruses DNA strand

Double-stranded circular DNA. e.g. Human papilloma-virus

Have Double-stranded linear Contain 40 antigenic types.

Very small, Single stranded linear 2 types of parvoviruses: * Defective * Non-defective

Double-stranded e.g Hepatitis B virus

Double stranded, linear DNA e.g Herpes simplex virus

Largest virus with a bricklike shape e.g. Smallpox virus

RNA 14 families: Picornavirus Calicivirus Reovirus Flavivirus Togavirus Retrovirus Orthomyxovirus  RNA Structure

 Paramyxovirus  Rhabdovirus  Filovirus  Coronavirus  Arenavirus  Bunyavirus  D eltavirus.  Double stranded RNA

Smallest virus in Single stranded, linear RNA within a non-enveloped icosahedral capsid. e.g, Poliovirus

Non-enveloped, icosahedral Single stranded, linear, RNA. e.g. Hepatitis E virus. 3D Calicivirus

Non-enveloped family with two icosahedral capsid Double stranded, linear RNA. e.g. Rotavirus.

Enveloped, icosahedral, Single stranded, linear, RNA viruses e.g. Yellow fever virus,

Enveloped, icosahedral, Single stranded, linear, RNA family e.g. R ubella virus

Enveloped, icosahedral, with Single stranded linear RNA family e.g. HIV.

Enveloped, helical capsid and linear, Single stranded RNA. e.g. Influenza virus

Enveloped, helical, Single stranded, linear, RNA family e.g. Measles virus

Bullet-shaped, enveloped, with a helical, Single stranded, linear, RNA family. e.g. Rabies virus

Enveloped, helical, Single stranded, linear, RNA family. e.g. Ebola virus.

Enveloped, helical, Single stranded, linear, RNA "corona" refers to crown of spikes protruding from envelope.

Enveloped, helical, Single stranded, circular RNA family e.g. Lassa fever virus.

Enveloped, helical, Single stranded, circular, RNA "bunya" refers to the place in Africa where it was isolated.

Enveloped, helical, circular, Single stranded RNA family e.g. Hepatitis delta virus (HDV)