Virus Nyeba

This article is about the type of pathogen. For the type of malware, see Computer virus. For other uses, see Virus (disambiguation).
For a more accessible and less technical introduction to this topic, see Introduction to viruses.
A virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism.[1] Viruses infect all types of life forms, from animals and plants to microorganisms, including bacteria and archaea.[2] Since Dmitri Ivanovsky's 1892 article describing a non-bacterial pathogen infecting tobacco plants and the discovery of the tobacco mosaic virus by Martinus Beijerinck in 1898,[3] more than 6,000 virus species have been described in detail[4] of the millions of types of viruses in the environment.[5] Viruses are found in almost every ecosystem on Earth and are the most numerous type of biological entity.[6][7] The study of viruses is known as virology, a subspeciality of microbiology.