A submicroscopic, non-cellular structure consisting of a core of DNA or RNA surrounded by a protein coat, that requires a living host cell to replicate, and often causes disease in the host organism; such agents are often classed as nonliving infectious particles and less often as microorganisms.

(nonstandard) To send or infect an electronic device with a computer virus.

Alternative spelling of antivirus

(virology) Any virus with more than 300,000 base pairs in its genome (genomic nucleic acid coding).

A human double-stranded DNA virus of the species JC polyomavirus, causing progressive multifocal leukoencephalopathy and other diseases in immunodeficient patients.

Jamestown Canyon virus

Any of a group of viruses whose nucleic acid is composed of DNA

Any of several virus strains in genus Norovirus that cause acute gastrointestinal infection. / The disease caused by the virus.

A concept which is transmitted between people via networks (especially the Internet) generally without the knowledge or consent of the originator, and which may be modified as it is passed on.

Any extremely contagious filovirus infection of African origin that causes Ebola fever, spread through contact with bodily fluids or secretions of infected persons and by airborne particles, caused by the viruses in genus Ebolavirus.