The Big Picture Book of Viruses: Reoviridae

Host: Virus infects invertebrates, plants, and vertebrates.

Genome: RNA. Double stranded. Linear. Genome monomeric. Genome in six parts. In 10-12 segments (depending on genus); total genome 18200-30500 nucleotides long. 5' terminus has a methylated nucleotide cap (on the positive strand of each duplex, the negative strands have a phosphorylated terminus). Cap sequence m7G5ppp5'GmpNp (type A). 3' terminus has no poly (A) tract. Encapsidated nucleic acid solely genomic. Genome found in one type of particle only. Each virion contains a single copy of genome; full length copy.

Morphology: Virions not occluded, or occluded by protein bodies or crystals in thin sections (sometimes); not enveloped. Virions one type of particle only. Capsids isometric. Capsid shell of virion composed of two layers, or three layers; shell of virion all usually present, or outer often lost. Nucleocapsids with obvious regular surface structure; 60-80 nm in diameter. Symmetry icosahedral. Nucleocapsids appear to be round. Surface capsomer arrangement obvious. Surface projections of nucleocapsid not seen (surface apparently smooth), or not present, or distinct; spikes; restricted to (the 12 vertices). Incomplete virus particles often present; are empty capsids, or are incompletely assembled capsids. Virions only of one kind.

(Note: for more information about the taxonomy and structure of this virus, see the ICTV database below.)

Reoviridae Images:
Genus	Sub-Genus	EM Images	Example Virus Name	Description of Image
Orthoreovirus
	Mammalian orthoreoviruses	N/A	reovirus 3 (strain Dearing)
			an animal reovirus	From Stewart McNulty at Veterinary Sciences, Queen's University, Belfast.
			Mammalian reovirus virion	solved by cryo-electron microscopy and image reconstruction from the Institute for Molecular Virology - Wisconsin.
			Mammalian reovirus ISVP	solved by cryo-electron microscopy and image reconstruction from the Institute for Molecular Virology - Wisconsin.
			Mammalian reovirus core	solved by cryo-electron microscopy and image reconstruction from the Institute for Molecular Virology - Wisconsin.
	Avian orthoreoviruses	N/A
Orbivirus
	African horse sickness group	N/A	African horse sickness viruses 1
	Bluetongue virus group	N/A	Bluetongue viruses 1
	Changuinola virus group	N/A
	Corriparta virus group	N/A
	Epizootic hemarrhogic disease virus group	N/A	Epizootic hemarrhogic disease virus 1
	Equine encephalosis virus group	N/A
	Eubenangee virus group	N/A
	Lebombo virus group	N/A
	Orungo virus group	N/A
	Palyam virus group	N/A
	Umatilla virus group	N/A
	Wallal virus group	N/A
	Warrego virus group	N/A
	Kemerovo virus group	N/A
Rotavirus
	Group A rotaviruses	N/A	Simian rotavirus SA11
			rotavirus particles	Note the wheel-like appearance of some of the rotavirus particles. The observance of such particles gave the virus its name ('rota' being the Latin word meaning wheel). Bar = 100 nanometers. Source: Cell culture. Method: Negative-stain Transmission Electron Microscopy By F.P. Williams, U.S. Environmental Protection Agency.
			animal rotavirus	From Stewart McNulty at Veterinary Sciences, Queen's University, Belfast.
			rotavirus	an example virus image from the ICTV
			rotavirus	Two transmission electron micrographs illustrating the appearance of negatively stained rotavirus as seen in a stool sample. From the Wadsworth Center of the New York State Department of Health.
			human rotavirus	(from Linda Stannard, of the Department of Medical Microbiology, University of Cape Town)
			human rotavirus	inner capsid in a drawing is shown side-by-side with a colourised EM image; (from Linda Stannard, of the Department of Medical Microbiology, University of Cape Town)
			human rotavirus	a double-capsid particle is shown on the left, and the single (inner) capsid on its right; (from Linda Stannard, of the Department of Medical Microbiology, University of Cape Town)
			human rotavirus	The outer capsid is positioned upon the virion in such a way that the capsomeres of each capsid layer co-incide. (from Linda Stannard, of the Department of Medical Microbiology, University of Cape Town)
	Group B rotaviruses	N/A
	Group C rotaviruses	N/A	porcine Cowden strain
	Group D rotaviruses	N/A
	Group E rotaviruses	N/A
Coltivirus
		N/A	Colorado tick fever virus
Aquareovirus
	Group A aquareoviruses	N/A	Simian rotavirus SA11
	Group B aquareoviruses	N/A
	Group C aquareoviruses	N/A	Golden shiner virus
	Group D aquareoviruses	N/A
	Group E aquareoviruses	N/A
Cypovirus
	Cypovirus type 1	N/A	Bombyx mori cypovirus 1
	Cypovirus type 2	N/A
	Cypovirus type 3	N/A
	Cypovirus type 4	N/A
	Cypovirus type 5	N/A
	Cypovirus type 6	N/A
	Cypovirus type 7	N/A
	Cypovirus type 8	N/A
	Cypovirus type 9	N/A
	Cypovirus type 10	N/A
	Cypovirus type 11	N/A
	Cypovirus type 12	N/A
Fijivirus
	Fijivirus group 1	N/A	Fiji disease virus
	Fijivirus group 2	N/A
	Fijivirus group 3	N/A
Phytoreovirus
		N/A	Wound tumor virus
Oryzavirus
		N/A	Rice ragged stunt