| Abbreviations | Meaning |
 | CGV | Chobar Gorge Virus |
 | CHADV | Chimpanzee Adenovirus |
 | CHHV | Chelonid Herpesvirus |
 | CHIKV | Chikungunya Virus |
 | CHIMV | Chim Virus |
 | CHIV | Chilibre Virus |
 | CHOV | Chaco Virus |
 | CHPV | Chandipura Virus; Chicken Parvovirus |
 | CHPV | Chipmunk Parvovirus |
 | CHRV | Chub Reovirus |
 | CHV | Canine Herpes Virus; Cryphonectria Hypovirus |
 | CHVV | Charleville Virus |
 | CHYNMV | Chinese Yam Necrotic Mosaic Virus |
 | CIEBOV | Cote D'Ivoire Ebola Virus |
 | CIHV | Ciconiid Herpesvirus |
 | CIIV | Casinaria Infesta Ichnovirus |
 | CIV | Carey Island Virus; Ceratitis I Virus; Continuous Intravenous Infusion |
 | CJSV | Carajas Virus |
 | CLEV | Chironomus Luridus Entomopoxvirus |
 | CLMV | Cauliflower Mosaic Virus |
 | CLRV | Cherry Leaf Roll Virus; Cimex Lectularius Reovirus |
 | CLSV | Cucumber Leaf Spot Virus |
 | CLV | Carnation Latent Virus |
 | CLV | Cassava Latent Virus |
 | CLV | Colletotrichum Lindemuthianum Virus |
 | CLV | Common Latent Virus |
 | CMBV | Citrus Mosaic Virus |
 | CMLV | Camelpox Virus |
 | CMN | Canine Minute Virus; Caudal Mediastinal Node; Certification Of Medical Necessity; Cystic Medial Necrosis |
 | CMOMV | Carrot Mottle Mosaic Virus |
 | CMOV | Carrot Mottle Virus; Chlorotic Mottle Virus |
 | CMV | Canine Minute Virus |
 | CMV | Cassava Mosaic Virus |
 | CMV | Chlorotic Mottle Virus |
 | CMV | Clo Mor Virus |
 | CMV | Common Mosaic Virus |
 | CMV | Cowpea Mosaic Virus |
 | CMV | Cucumber Mosaic Virus |
 | CMV | Curly Mottle Virus |
 | CMV | Cytomegalovirus |
 | CMV-E | Cytomegalovirus Encephalitis |
 | CMV-MN | Cytomegalovirus Mononucleosis |
 | CMV-VE | Cytomegalovirus Ventriculoencephalitis |
 | CMVIG | Cytomegalo Virus Immune Globulin |
 | CNAV | Cananeia Virus |
 | CNFV | Carnation Necrotic Fleck Virus |
 | CNMOV | Cynosurus Mottle Virus |
 | CNPV | Canarypox Virus; Continuous Negative Pressure Ventilation |
 | CNTV | Connecticut Virus |
 | CNUV | Ch Nuda Virus |