Mounica Merihelan*
A virus could be a sub microscopic agent that replicates solely within the living cells of associate degree organism. Viruses infect all sorts of life forms, from animals and plants to microorganisms, together with microorganism and archaea. Since Dmitri Ivanov sky’s 1892 article describing a non-bacterial infectious agent infecting tobacco plants and also the discovery of the mosaic virus by Martinus Beijerinck in 1898, quite half dozen, virus species are delineating intimately of the various kinds of viruses within the setting. Viruses are found in nearly each scheme on Earth and are the foremost various kinds of biological entity. The study of viruses is thought as medicine, a subspeciality of biology.
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