| Abbreviations | Meaning |
 | CAV | Croup-associated Virus |
 | CAVHV | Caviid Herpesvirus |
 | CAWLV | Caraway Latent Virus |
 | CAYMV | Canine Yellow Mottle Virus |
 | CB3S | Coxsackie B3 Virus Susceptibility |
 | CBDV | Colocasia Bobone Disease Virus |
 | CBEV | Choristoneura Biennis Entomopoxvirus |
 | CBHV | Cebine Herpesvirus |
 | CBNV | Colony B North Virus |
 | CBPV | Chronic Bee Paralysis Virus |
 | CBV | Carnation Bacilliform Virus |
 | CBV | Coxsackie B Virus |
 | CCCV | Callistephus Chinensis Chlorosis Virus |
 | CCEV | Cardamine Chlorotic Fleck Virus; Choristoneura Conflicta Entomopoxvirus |
 | CCFV | Cardamine Chlorotic Fleck Virus |
 | CCMOV | Cereal Chlorotic Mottle Virus |
 | CCMV | Cowpea Chlorotic Mottle Virus |
 | CCOV | Canine Coronavirus |
 | CCRV-W2 | Carcinus Mediterraneus W2 Virus |
 | CCV | Carnation Cryptic Virus; Channel Catfish Virus; Closed Circuit Voltage; Conductivity Cell Volume |
 | CDCV | Caddo Canyon Virus |
 | CDEV | Choristoneura Diversuma Entomopoxvirus |
 | CDMV | Cardamom Mosaic Virus |
 | CDTV | Chino Del Tomate Virus |
 | CDUV | Candiru Virus |
 | CDV | Canine Distemper Virus; Chlorotic Dwarf Virus; Clinical Diagnostic Validity; Colombian Datura Virus |
 | CEBV | Chronic Epstein-Barr Virus [infection] |
 | CEDNV | Casphalia Externa Densovirus |
 | CEEV | Central European Encephalitis Virus |
 | CEHV | Cercopithecine Herpesvirus |
 | CELCER1V | Caenorhabditis Elegans Cer1 Virus |
 | CELO | Chick Embryonal Lethal Orphan [virus] |
 | CEMV | Celery Mosaic Virus; Cetacean Morbillivirus |
 | CER1V | Cer1 Virus |
 | CEV | California Encephalitis Virus; Citrus Exocortis Viroid |
 | CEYMB | Celery Yellow Mosaic Virus |
 | CEYMV | Celery Yellow Mosaic Virus |
 | CFAV | Cell Fusing Agent Virus |
 | CFCPV | Choristoneura Fumiferana Cypovirus |
 | CFEV | Choristoneura Fumiferana Entomopoxvirus |
 | CFIV | Campoletis Flavicincta Ichnovirus |
 | CFMNPV | Choristoneura Fumiferana Multiple Nucleopolyhedrovirus |
 | CFOIV | Casinaria Forcipata Ichnovirus |
 | CFUT1V | Cladosporium Fulvum T-1 Virus |
 | CFUV | Corfu Virus |
 | CFV | Chimpanzee Foamy Virus; Chlorotic Fleck Virus; Chrysanthemum Frutescens Virus; Continuous Flow Ventilation |
 | CFV/HU | Chimpanzee Foamy Virus/human |
 | CGLV | Changuinola Virus |
 | CGMMV | Cucumber Green Mottle Mosaic Virus |
 | CGRMV | Cherry Green Ring Mottle Virus |