[ A virus (from the Latin virus meaning toxin or poison) is a sub-microscopic infectious agent that is unable to grow or reproduce outside a host cell. Viruses infect all cellular life. The first known virus, tobacco mosaic virus, was discovered by Martinus Beijerinck in 1898 and now more than 5,000 types of virus have been described. The study of viruses is known as virology, and is a branch of microbiology ].
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