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In viruses and microorganisms traditional taxonomical concepts rarely work, and now essentially all major players agree that species is not a valid and meaningful entity to describe these forms of life. Here one can talk about strains, or even just isolates.

The reason for this is that the genome of these organisms are not very stable, as they continuously undergo various forms of genome shuffling.

Therefore you are less and less likely to find Linnean-like names for viruses and microorganisms.