Viruses (Taxonomic Rank: Group)
Small infectious agents that can replicate only inside the living cells of other organisms including satellites and the nucleic acid-neutral prions.

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	Alpharetrovirus Alphatorquevirus (ss) Bovine spongiform encephalopathy (Prion) Circovirus (ss) Cyclovirus (ss) Cytomegalovirus (ds) Gammaretrovirus Giardiavirus (ds) Iltovirus (ds) Lagovirus (ss+) Leishmaniavirus (ds) Nyavirus (ss-) Ophiovirus (ss-) Orthohepadnavirus Potato spindle Tuber Viroid Sapovirus (ss+) Simplexvirus (ds) Virtovirus (Satellite)

= Extinct Life Forms   = Living Creatures   = Fictional Beasts   = Inanimate Objects   = Ethereal Entities    = At least one collectible is catalogued