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Category: Medical
Word Count: 1987
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Virus

Virus (Latin for “poison”), any of a number of organic entities consisting simply of genetic material surrounded by a protective coat. The term virus was first used in the 1890s to describe agents that caused diseases but were smaller than bacteria. By itself a virus is a lifeless form, but within living cells it can replicate many times and harm its host in the process. The hundreds of known viruses cause a wide range of diseases in humans, other animals, insects, bacteria, and plants (see DISE
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