Un virus est une particule microscopique infectieuse qui ne peut se répliquer qu’en pénétrant dans une cellule et en utilisant sa machinerie cellulaire. A virus is often housed in a protein coat or protein envelope, a protective covering which allows the virus to survive between hosts.. Definition: A computer virus is a malicious software program loaded onto a user’s computer without the user’s knowledge and performs malicious actions. The virus particles may then either end up on a new potential host or an inanimate object. Medical Definition of Coronavirus. Most people will be infected with at least one type of coronavirus in their lifetime. Antibiotics don't affect a virus. They are always induced by people. These contaminated objects are known as fomites, and can play an important role in … A virus is a microscopic parasite that can infect living organisms and cause disease. It can make copies of itself inside another organism's cells. Usually the nucleic acid is RNA; sometimes it is DNA.Viruses are able to cause many types of diseases, such as polio, ebola and hepatitis. It explains in computing terminology what Virus means and is one of many software terms in the TechTerms dictionary. Seven different types of human coronavirus have been identified. Virus SARS-CoV-2, a member of the subfamily Coronavirinae Virus classification (unranked): Virus Realms Duplodnaviria Monodnaviria Riboviria Varidnaviria A virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism. Medical Author: Melissa Conrad Stöppler, MD; Coronavirus: a type of common virus that infects humans, typically leading to an upper respiratory infection (URI.) What a virus is. The structure of a virus and how it infects a cell. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. A virus is a very tiny, infectious particle that lives inside of its host, which can be any living organism. Learn more. Virus Definition. Virus Structure Viruses consist of nucleic acid and a protein coat. The structure of a virus and how it infects a cell. All definitions on the TechTerms website are written to be technically accurate but also easy to understand. This page contains a technical definition of Virus. Virology is the study of viruses. virus meaning: 1. an extremely small piece of organic material that causes disease in humans, animals, and plants…. A virus is a microscopic organism that invades living cells in order to reproduce. Description: The term 'computer virus' was first formally defined by Fred Cohen in 1983.Computer viruses never occur naturally. Viruses infect all types of life forms, from animals and plants to microorganisms, including bacteria and archaea. Many, like influenza, cause illness. 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