- La Crosse virus
- Lacanobia oleracea granulovirus
- Lactate dehydrogenase-elevating virus
- Lactic dehydrogenase elevating virus
- Lactic dehydrogenase virus
- Lactobacillus phage LP65
- Lactococcus phage bIL67
- Lactococcus phage c2
- Lactococcus phage KSY1
- Lagos bat virus
- Laguna Negra virus
- Lambda phage
- Lambdapapillomavirus 1
- Lambdapapillomavirus 2
- Lambdapapillomavirus 3
- Lambdapapillomavirus 4
- Lamium leaf distortion virus
- Lamium mild mosaic virus
- Langat virus
- Langur virus
- Lapine parvovirus
- Lassa fever virus
- Lassa virus
- Latent rat virus
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- Latino virus
- Lato River virus
- LCM virus
- Leaky virus
- Lebombo virus
- Leek white stripe virus
- Leek yellow stripe virus
- Leishmania RNA virus 1 - 1
- Leishmania RNA virus 1 - 2
- Leishmania RNA virus 1 - 3
- Leishmania RNA virus 1 - 4
- Leishmania RNA virus 1 - 5
- Leishmania RNA virus 1 - 6
- Leishmania RNA virus 1 - 7
- Leishmania RNA virus 1 - 8
- Leishmania RNA virus 1 - 9
- Leishmania RNA virus 1 - 10
- Leishmania RNA virus 1 - 11
- Leishmania RNA virus 1 - 12
- Leishmania RNA virus 2 - 1
- Lentivirus
- Leporid herpesvirus 4
- Leporipoxvirus
- Lettuce big-vein associated virus
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- Lettuce chlorosis virus
- Lettuce infectious yellows virus
- Lettuce mosaic virus
- Lettuce necrotic yellows virus
- Lettuce ring necrosis virus
- Lettuce speckles mottle virus
- Lettuce virus X
- Lettuce yellow mottle virus
- Leukovirus
- Liao ning virus
- Ligustrum necrotic ringspot virus
- Lilac leaf chlorosis virus
- Lilac mottle virus
- Lilac ring mottle virus
- Lilium henryi Del1 virus
- Lily mottle virus
- Lily symptomless virus
- Lily virus X
- Limonium flower distortion virus
- Lindernia anagallis yellow vein virus
- Listeria phage A511
- Listeria phage P100
- Little cherry virus 1
- Little cherry virus 2
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- Ljungan virus
- Locusta migratoria entomopoxvirus 'O'
- Lolium latent virus
- Louping ill virus
- Lucerne Australian latent virus
- Lucerne transient streak virus
- Ludwigia yellow vein Vietnam virus
- Ludwigia yellow vein virus
- Luffa yellow mosaic virus
- LuIII virus
- Lujo virus
- Lumpy skin disease virus
- Luteovirus
- Lychnis ringspot virus
- Lycopersicon esculentum ToRTL1 virus
- Lycoris mild mottle virus
- Lymantria dispar multiple nucleopolyhedrovirus
- Lymphadenopathy Associated Virus
- Lymphocryptovirus
- Lymphocystis disease virus 1
- Lymphocytic choriomeningitis virus
- Lymphoproliferative virus group
- Lyssavirus
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