Editing Virus classification (section)

== Historical systems ==

=== Holmes classification ===
[[Francis O. Holmes|Holmes]] (1948) used a [[Linnaean taxonomy]] with [[binomial nomenclature]] to classify viruses into 3 groups under one order, [[Virales]]. They are placed as follows:
* '''Group I:''' ''[[Bacteriophage|Phaginae]]'' (attacks bacteria)
* '''Group II:''' ''[[Plant virus|Phytophaginae]] ''(attacks plants)
* '''Group III:''' ''[[Animal virus|Zoophaginae]]'' (attacks animals)

The system was not accepted by others due to its neglect of morphological similarities.<ref>{{cite book |last1=Kuhn |first1=Jens H. |chapter=Virus Taxonomy |title=Reference Module in Life Sciences |series=Encyclopedia of Virology |date=2020 |pages=28–37 |doi=10.1016/B978-0-12-809633-8.21231-4 |isbn=978-0-12-809633-8 |pmc=7157452 }}</ref>