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This article is about a biological infectious particle; for the computer term, see computer virus. For other uses, see virus (disambiguation).

A virus (Latin, poison) is a submicroscopic particle that can infect the cells of a biological organism. At the most basic level viruses consist of genetic material contained within a protective protein shell called a capsid, which distinguishes them from other virus-like particles such as prions and viroids. The study of viruses is known as virology, and those who study viruses are called virologists.

Viruses are similar to obligate intracellular parasites as they lack the means for self-reproduction outside a host cell, but unlike parasites, which are living organisms, viruses are not truly alive. They infect a wide variety of organisms, both eukaryotes (such as animals and plants) and prokaryotes (such as bacteria). A virus infecting bacteria is known as a bacteriophage, which is used mainly in its shortened form phage.

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Viral Diseases
Immunizations :: Disease Control and Prevention
Virology :: Microbiology

 
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I suppose that it’s the nature of our world: over time, things become sick, and sometimes... http://t.co/hZmkT7Bt #Avoiding_the_Viruses
creativereading (Kam Jaw) Tue, 15 May 2012 02:00:57 -0000
I suppose that it’s the nature of our world: over time, things become sick, and sometimes... http://t.co/hZmkT7Bt #Avoiding_the_Viruses
RT @Bailey_Su: These dang twitter viruses are going around like STD's #noidontwannalose20poundsinoneweek
MattPishna (Matt Pishna) Tue, 15 May 2012 02:00:35 -0000
RT @Bailey_Su: These dang twitter viruses are going around like STD's #noidontwannalose20poundsinoneweek
Genetically-engineered viruses may power devices of the future - TechSpot News http://t.co/KQaAhC1P via @techspot
hanspal (Harinderpal Hanspal ) Tue, 15 May 2012 01:59:42 -0000
Genetically-engineered viruses may power devices of the future - TechSpot News http://t.co/KQaAhC1P via @techspot
Many viruses and diseases can be prevented simply by keeping hands clean. Enforce hand washing..the life you save may be your child's.
handwashpeople (Danny & Susan Pratts) Tue, 15 May 2012 01:59:29 -0000
Many viruses and diseases can be prevented simply by keeping hands clean. Enforce hand washing..the life you save may be your child's.
Scientists generate electricity from viruses http://t.co/Zw59359e #fb
ShamanicShift (Elizabeth) Tue, 15 May 2012 01:58:44 -0000
Scientists generate electricity from viruses http://t.co/Zw59359e #fb
#WeWontWork IF YOU KEEP SENDING ME THESE DAMN VIRUSES. TAKE A NAP.
beccalorenzo (Rebecca Lorenzo) Tue, 15 May 2012 01:58:38 -0000
#WeWontWork IF YOU KEEP SENDING ME THESE DAMN VIRUSES. TAKE A NAP.

 
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Complete Tospovirus Resource and Database - Tospoviruses, the only plant infecting members of Bunyaviridae, are a worldwide problem. This site features a searchable database of host plants.
Meta Description: [ Created to help researchers and growers alike in expanding their understanding of tospoviruses and their vectors ]

Index of Viruses - Database of virus names, acronyms, hosts, and nucleic acids.

Principles of Virus Architecture - Information regarding virus structures, images, and the use of stain to identify them.

The Big Picture Book of Viruses - Specific information on viral families, genomes, taxonomy, and structure.

The Influenze Sequence Database - Database of virus information including nucleotide sequences.
Meta Description: [ A comprehensive database of influenza nucleotide sequences, with search and analysis tools. ]

500 Virus Databases Online - Catalogue of virus databases on the web.

404 Virus Nomenclature - Information required to classify a virus within a taxonomic group.

404 Viruses - From Structure to Biology - Introduction and historical timeline of viral research.
Meta Description: [ Virology - The Study of viruses. ]

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