Un virus est une particule microscopique infectieuse qui ne peut se répliquer qu’en pénétrant dans une cellule et en utilisant sa machinerie cellulaire. Many, like influenza, cause illness. These contaminated objects are known as fomites, and can play an important role in … The structure of a virus and how it infects a cell. Medical Definition of Coronavirus. Virus Structure 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. Learn more. A virus is a very tiny, infectious particle that lives inside of its host, which can be any living organism. It can make copies of itself inside another organism's cells. A virus is a microscopic organism that invades living cells in order to reproduce. Virus Definition. They are always induced by people. Medical Author: Melissa Conrad Stöppler, MD; Coronavirus: a type of common virus that infects humans, typically leading to an upper respiratory infection (URI.) All definitions on the TechTerms website are written to be technically accurate but also easy to understand. Most people will be infected with at least one type of coronavirus in their lifetime. This page contains a technical definition of Virus. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. 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. Seven different types of human coronavirus have been identified. Antibiotics don't affect a virus. Viruses consist of nucleic acid and a protein coat. Viruses infect all types of life forms, from animals and plants to microorganisms, including bacteria and archaea. Virology is the study of viruses. It explains in computing terminology what Virus means and is one of many software terms in the TechTerms dictionary. A virus is a microscopic parasite that can infect living organisms and cause disease. If you're seeing this message, it means we're having trouble loading external resources on our website. virus meaning: 1. an extremely small piece of organic material that causes disease in humans, animals, and plants…. The structure of a virus and how it infects a cell. 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. Description: The term 'computer virus' was first formally defined by Fred Cohen in 1983.Computer viruses never occur naturally. 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