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Virus is a pathogenic agent with an outer protein coat with nucleic acid molecule inside, and multiply only within host living cells. Size varies among different classes of viruses. Most viruses vary in diameter from 17nm (porcine circovirus) (nm; 0.0000008 inch) to 500 nm like Herpes simplex virus-I (125nm) or HIV-I virus (120-150nm); the largest, however, measure about 500 nm (mimi virua, Pandora Virus) in diameter and are about 700–1,000 nm in length. only large viruses can be visualized under normal microscope.

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Ahmad Raza

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3y ago

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