“VIRUSES are transmissible deoxyribonucleic acid (DNA) or ribonucleic acid (RNA) genetic elements that require a cell for multiplication. Viruses are extremely diverse and ubiquitous in nature. They evolve in continuous interaction with their host cells and organisms, following the general Darwinian principles: genetic variation, competition among variant forms and selection of the most fit variants in a given environment. Viruses probably had an ancient origin and have survived as agents of gene transfer and promoters of cell variation.”
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