| 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 |