O [ edit ] O'nyong-nyong virus Oat blue dwarf virus Oat chlorotic stunt virus Oat dwarf virus Oat golden stripe virus Oat mosaic virus Oat necrotic mottle virus Oat sterile dwarf virus Obodhiang ephemerovirus Obuda pepper virus Odontoglossum ringspot virus Oedaleus senegalensis entomopoxvirus Okahandja mammarenavirus Okra enation leaf curl virus Okra mosaic virus Okra mottle virus Okra yellow crinkle virus Okra yellow mosaic Mexico virus Olesicampe benefactor ichnovirus Olesicampe geniculatae ichnovirus Olifantsvlei orthobunyavirus Olive latent ringspot virus Olive latent virus 1 Olive latent virus 2 Olive latent virus 3 Olive leaf yellowing-associated virus Olive mild mosaic virus Oliveros mammarenavirus Omegapapillomavirus 1 Omikronpapillomavirus 1 Omsk hemorrhagic fever virus Oncorhynchus 1 novirhabdovirus Oncorhynchus 2 novirhabdovirus Onion yellow dwarf