TABLE 134-1.

Classification of Viruses

FAMILY	EXAMPLE	TYPE OF NUCLEIC ACID	GENOME SIZE (kb or kb pair)	ENVELOPE	CAPSID SYMMETRY
RNA-Containing Viruses
Picornaviridae	Poliovirus	SS (+) RNA	7-9	No	I
Astroviridae	Astrovirus	SS (+) RNA	6-7	No	I
Caliciviridae	Norwalk virus	SS (+) RNA	7-8	No	I
Togaviridae	Rubella virus	SS (+) RNA	10-12	Yes	I
Flaviviridae	Yellow fever virus	SS (+) RNA	10-12	Yes	S
Coronaviridae	Coronavirus	SS (+) RNA	28-31	Yes	H
Rhabdoviridae	Rabies virus	SS (−) RNA	11-15	Yes	H
Paramyxoviridae	Measles virus	SS (−) RNA	13-18	Yes	H
Filoviridae	Ebola virus	SS (−) RNA	19	Yes	H
Arenaviridae	Lymphocytic choriomeningitis virus	2 SS (ambisense) RNA segments	11	Yes	S
Bunyaviridae	California encephalitis virus	3 SS (ambisense) RNA segments	11-19	Yes	H
Orthomyxoviridae	Influenza virus	6-8 SS (−) RNA segments*	10-15	Yes	H
Reoviridae	Rotavirus	10-12 DS RNA segments*	19-32	No	I
Retroviridae	HIV	2 identical SS (+) RNA segments	7-13	Yes	S
DNA-Containing Viruses
Hepadnaviridae	Hepatitis B virus	Circular DS DNA with SS portions	3-4	Yes	I
Parvoviridae	Human parvovirus B19	SS (+) or (−) DNA	4-6	No	I
Polyomaviridae	JC virus	Circular DS DNA	5	No	I
Papillomaviridae	Human papillomavirus	Circular DS DNA	7-8	No	I
Adenoviridae	Adenovirus	Linear DS DNA	26-45	No	I
Herpesviridae	Herpes simplex virus	Linear DS DNA	125-240	Yes	I
Poxviridae	Vaccinia virus	Linear DS DNA	130-375	Yes	Complex

(+), message sense; (−), complement of message sense; DS, double-stranded; H, helical; I, icosahedral; S, spherical; SS, single-stranded.

^*Reovirus and orbivirus, 10 segments; rotavirus, 11 segments; Colorado tick fever virus, 12 segments.

Data from Condit RC. Principles of virology. In: Knipe DM, Howley PM, eds. Fields Virology. 5th ed. Philadelphia: Lippincott-Raven Press; 2007:25-57.