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16,213 named virus species (including some classed as satellite viruses and others as viroids) in 3,768 genera, 368 families, 93 orders, 49 classes, 22 phyla, 11 kingdoms and 7 realms. However, the number of named viruses considerably exceeds the number of named virus species since, by contrast to the classification systems used elsewhere in biology, a virus "species" is a collective name for a group of (presumably related) viruses sharing certain common features

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