- Faba bean necrotic stunt virus
- Faba bean necrotic yellows virus
- Fabavirus
- Falcon adenovirus A
- Feldmannia irregularis virus a
- Feldmannia species virus
- Feldmannia species virus a
- Felid herpesvirus 1
- Feline calicivirus
- Feline fibrosarcoma virus
- Feline foamy virus
- Feline herpesvirus
- Feline immunodeficiency virus
- Feline infectious peritonitis virus
- Feline leukemia /sarcoma virus
- Feline leukemia virus
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- Feline panleukopenia virus
- Feline parvovirus
- Feline sarcoma virus
- Feline syncytial virus
- Fer-de-Lance paramyxovirus
- Festuca leaf streak virus
- Fig mosaic virus
- Figulus subleavis entomopoxvirus
- Figwort mosaic virus
- Fiji disease virus
- Fijukivirus
- Filovirus
- Finch circovirus
- Finkel-Biskis-Jinkins murine sarcoma virus
- Flanders virus
- Flavivirus
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- Flexal virus
- Flock House virus
- Foot and mouth disease virus
- Foot-and-mouth disease virus
- Fort Morgan virus
- Four Corners hantavirus
- Fowl adenovirus 1
- Fowl adenovirus A
- Fowl adenovirus B
- Fowl adenovirus C
- Fowl adenovirus D
- Fowl adenovirus E
- Fowlpox virus
- Foxtail mosaic virus
- Fragaria chiloensis latent virus
- Frangipani mosaic virus
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- Freesia mosaic virus
- Freesia sneak virus
- Friend virus
- Frijoles virus
- Fritillary virus Y
- Frog adenovirus A
- Frog virus 3
- Fugu rubripes Suzu virus
- Fujinami sarcoma virus
- Furovirus
- Fusarium oxysporum Skippy virus
- Fusarium poae virus 1
- Fusarium solani virus 1
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