Virus

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A non-cellular particle that consists of genetic material, whether DNA or RNA, enzymes and a protein coat. Unlike cells, they do not possess the necessary machinery to replicate. For a virus to replicate, it must first infect a living cell. It uses the DNA and other machinery of a cell to make viral proteins and assemble new copies of itself. Once new viral copies are produced they exit the cell into the blood, usually destroying the cell in the process.