| Abbreviations | Meaning |
 | FHV | Falcon Herpesvirus; Flock House Virus |
| FICCV | Ficus Carica Virus |
| FINV | Fin V 707 Virus |
| FIPV | Feline Infectious Peritonitis Virus |
| FIV | Feline Immunodeficiency Virus; Forced Inspiratory Volume |
| FIV-O | Feline Immunodeficiency Virus (Oma) |
| FIV-P | Feline Immunodeficiency Virus (Petaluma) |
| FLAV | Flanders Virus |
| FLCV | Flame Chlorosis Virus |
| FLEV | Flexal Virus |
| FLUAV | Influenza A Virus |
| FLUBV | Influenza B Virus |
| FLUCV | Influenza C Virus |
| FLV | Feline Leukemia Virus; Friend Leukemia Virus; Fuzzy Linguistic Value |
| FMDV | Foot And Mouth Disease Virus |
| FORV | Forecariah Virus |
| FOS-R HIV | Foscarnet-resistant Human Immunodeficiency Virus |
| FOUV | Foula Virus |
| FPLV | Feline Panleukemia Virus |
| FPV | Feline Parvovirus |
| FPV | Feline Pseudoleukemia Virus |
| FPV | Feline Pseudoleukopenia Virus |
| FPV | Fowl Plague Virus |
| FPV | Fowlpox Virus |
| FPV | Fraser Point Virus |
| FRADV | Frog Adenovirus |
| FRIV | Frijoles Virus |
| FRMLV | Friend Murine Leukemia Virus |
| FRMV | Frangipani Mosaic Virus |
| FSEV | Figulus Subleavis Entomopoxvirus |
| FSV | Feline Fibrosarcoma Virus; Fort Sherman Virus; Forward Stroke Volume |
| FTLV | Feline T-lymphotropic Lentivirus |
| FUKAV | Fukuoka Virus |
| FUSV | Fujinami Sarcoma Virus |
| FV | Fever Virus |
| FV | Fibroma Virus |
| FV | Filiform Virus |
| FV | Foamy Virus |
| FV | Fomede Virus |
| FV | Friend Virus |
| FV | Frog Virus |
| FVA | Friend Virus Anemia |
| FVB | Friend Virus B-type |
| FVP | Friend Virus Polycythemia |
| FVS | Fetal Valproate Syndrome; Fig Virus S |
| FWPV | Fowlpox Virus |
| GADV | Goat [caprine] Adenovirus |
| GAFESV | Gardner-Arnstein Feline Sarcoma Virus |
| GAHV | Gallid Herpesvirus |
| GALV | Gibbon Ape Leukemia Virus |
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