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A virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism. When infected, a host cell is often forced to rapidly produce thousands of copies of the original virus. When not inside an infected cell or in the process of infecting a cell, viruses exist in the form of independent viral particles, or virions , consisting of i genetic material , i.
The shapes of these virus particles range from simple helical and icosahedral forms to more complex structures. Most virus species have virions too small to be seen with an optical microscope and are one-hundredth the size of most bacteria. The origins of viruses in the evolutionary history of life are still unclear. Some viruses may have evolved from plasmids , which are pieces of DNA that can move between cells.
Other viruses may have evolved from bacteria. In evolution, viruses are an important means of horizontal gene transfer , which increases genetic diversity in a way analogous to sexual reproduction. Because they possess some but not all such qualities, viruses have been described as "organisms at the edge of life" [ 10 ] and as replicators. Viruses spread in many ways.
One transmission pathway is through disease-bearing organisms known as vectors : for example, viruses are often transmitted from plant to plant by insects that feed on plant sap , such as aphids ; and viruses in animals can be carried by blood-sucking insects. Many viruses spread in the air by coughing and sneezing, including influenza viruses , SARS-CoV-2 , chickenpox , smallpox , and measles. Norovirus and rotavirus , common causes of viral gastroenteritis , are transmitted by the faecal—oral route , passed by hand-to-mouth contact or in food or water.
