- CA virus
- Cabassou virus
- Cabbage leaf curl Jamaica virus
- Cabbage leaf curl virus
- Cacao swollen shoot virus
- Cacao yellow mosaic virus
- Cache Valley virus
- Cacipacore virus
- Cactus virus 2
- Cactus virus X
- Caenorhabditis elegans Cer1 virus
- Caenorhabditis elegans Cer13 virus
- Cajanus cajan Panzee virus
- Calanthe mild mosaic virus
- Calibrachoa mottle virus
- Calicivirus
- California encephalitis virus
- Callitrichine herpesvirus 3
- Calopogonium yellow vein virus
- Camelpox virus
- Campoletis aprilis ichnovirus
- Campoletis flavicincta ichnovirus
- Campoletis sonorensis ichnovirus
- Camptochironomus tentans entomopoxvirus
- Canary circovirus
- Canarypox virus
- Candida albicans Tca2 virus
- Candida albicans Tca5 virus
- Candiru virus
- Canid herpesvirus
- Canid herpesvirus 1
- Canine adeno-associated virus
- Canine adenovirus A
- Canine coronavirus
- Canine distemper virus
- Canine herpesvirus
- Canine minute virus
- Canine parvovirus
- Canna yellow mottle virus
- Canna yellow streak virus
- Cano Delgadito virus
- Caper latent virus
- Capillovirus
- Capim virus
- Caprine arthritis encephalitis virus
- Caprine arthritis virus
- Caprine encephalitis virus
- Caprine Herpes Virus
- Caprine herpesvirus 1
- Caprine herpesvirus 2
- Capripox virus
- Carajas virus
- Caraparu virus
- Cardamine chlorotic fleck virus
- Cardamom bushy dwarf virus
- Cardamom mosaic virus
- Cardiochiles nigriceps bracovirus
- Cardiovirus
- Carey Island virus
- Carlavirus
- Carmovirus
- Carnation cryptic virus 1
- Carnation etched ring virus
- Carnation Italian ringspot virus
- Carnation latent virus
- Carnation mottle virus
- Carnation necrotic fleck virus
- Carnation ringspot virus
- Carnation vein mottle virus
- Carrot mottle mimic virus
- Carrot mottle virus
- Carrot necrotic dieback virus
- Carrot red leaf virus
- Carrot thin leaf virus
- Carrot virus Y
- Carrot yellow leaf virus
- Casinaria arjuna ichnovirus
- Casinaria forcipata ichnovirus
- Casinaria infesta ichnovirus
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- Cassava American latent virus
- Cassava brown streak virus
- Cassava common mosaic virus
- Cassava green mottle virus
- Cassava vein mosaic virus
- Cassava virus C
- Cassava virus X
- Cassia yellow blotch virus
- Catu virus
- Cauliflower mosaic virus
- Caulimovirus
- Caviid herpesvirus 1
- Caviid herpesvirus 2
- Celery mosaic virus
- Ceratitis capitata Yoyo virus
- Ceratobium mosaic virus
- Ceratocystis resinifera virus 1
- Cercopithecine herpesvirus 1
- Cereal yellow dwarf virus
- Cereal yellow dwarf virus-RPS
- Cereal yellow dwarf virus-RPV
- Cervid herpesvirus 1
- Cervid herpesvirus 2
- Cestrum yellow leaf curling virus
- Cetacean morbillivirus
- Cetacean pox virus
- Chaetoceros salsugineum DNA virus 01
- Chaetoceros socialis f. radians RNA virus 01
- Chaetoceros tenuissimus RNA virus 01
- Chalara elegans RNA Virus 1
- Chandipura virus
- Changuinola virus
- Channel catfish virus
- Chapare virus
- Charleville virus
- Chayote mosaic virus
- Chayote yellow mosaic virus
- Chelonid herpesvirus 5
- Chelonid herpesvirus 6
- Chelonus altitudinis bracovirus
- Chelonus blackburni bracovirus
- Chelonus inanitus bracovirus
- Chelonus insularis bracovirus
- Chelonus nr. curvimaculatus bracovirus
- Chelonus texanus bracovirus
- Chenopodium necrosis virus
- Chenuda virus
- Cherry green ring mottle virus
- Cherry leaf roll virus
- Cherry mottle leaf virus
- Cherry necrotic rusty mottle virus
- Cherry rasp leaf virus
- Cherry virus A
- Chick syncytial virus
- Chicken anemia virus
- Chicken parvovirus
- Chickenpox virus
- Chickpea chlorotic stunt virus
- Chickpea stunt disease associated virus
- Chicory yellow mottle virus
- Chikungunya virus
- Chilibre virus
- Chilli leaf curl virus
- Chilli ringspot virus
- Chilli veinal mottle virus
- Chiltepin yellow mosaic virus
- Chimpanzee herpesvirus
- Chinese artichoke mosaic virus
- Chinese wheat mosaic virus
- Chinese yam necrotic mosaic virus
- Chino del tomate virus
- Chipapillomavirus 1
- Chipapillomavirus 2
- Chironomus attenuatus entomopoxvirus
- Chironomus luridus entomopoxvirus
- Chironomus plumosus entomopoxvirus
- Chlamydia phage 1
- Chlamydia phage 2
- Chlamydia pneumoniae phage CPAR39
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- Chloris striate mosaic virus
- Chobar Gorge virus
- Choristoneura biennis entomopoxvirus 'L'
- Choristoneura conflicta entomopoxvirus 'L'
- Choristoneura diversuma entomopoxvirus 'L'
- Choristoneura fumiferana DEF multiple nucleopolyhedrovirus
- Choristoneura fumiferana entomopoxvirus 'L'
- Choristoneura fumiferana granulovirus
- Choristoneura fumiferana multiple nucleopolyhedrovirus
- Choristoneura rosaceana nucleopolyhedrovirus
- Chorizagrotis auxiliars entomopoxvirus 'L'
- Chrysanthemum chlorotic mottle viroid
- Chrysanthemum stem necrosis virus
- Chrysanthemum stunt viroid
- Chrysanthemum virus B
- Chrysochromulina brevifilum virus PW1
- Chub reovirus
- Chum salmon virus
- Citrus bark cracking viroid
- Citrus bent leaf viroid
- Citrus dwarfing viroid
- Citrus exocortis viroid
- Citrus leaf blotch virus
- Citrus leaf rugose virus
- Citrus leprosis virus C
- Citrus psorosis virus
- Citrus sudden death-associated virus
- Citrus tristeza virus
- Citrus variegation virus
- Citrus viroid V
- Citrus viroid VI
- Citrus yellow mosaic virus
- Cladosporium fulvum T-1 virus
- Classical swine fever virus
- Clerodendron golden mosaic virus
- Clitoria virus Y
- Clitoria yellow vein virus
- Closterovirus
- Clostridium phage phiC2
- Clostridium phage phiCD27
- Clostridium phage phiCD119
- Clover yellow mosaic virus
- Clover yellow vein virus
- Cocal virus
- Cocksfoot mild mosaic virus
- Cocksfoot mottle virus
- Cocksfoot streak virus
- Cocoa necrosis virus
- Coconut cadang-cadang viroid
- Coconut foliar decay virus
- Coconut tinangaja viroid
- Coho salmon reovirus
- Coital exanthema virus
- Cole latent virus
- Coleus blumei viroid 1
- Coleus blumei viroid 2
- Coleus blumei viroid 3
- Coleus vein necrosis virus
- Colombian datura virus
- Colorado tick fever virus
- Coltivirus
- Columbia SK virus
- Columbid herpesvirus 1
- Columnea latent viroid
- Commelina mosaic virus
- Commelina virus X
- Commelina yellow mottle virus
- Common cold virus
- Comovirus
- Congenital cytomegalovirus
- Coniothyrium minitans RNA virus
- Contagious ecthyma virus
- Contagious pustular dermatitis virus
- Corchorus golden mosaic virus
- Corchorus yellow spot virus
- Corchorus yellow vein virus
- Coronavirus
- Corriparta virus
- Coryza virus
- Cotesia congregata bracovirus
- Cotesia flavipes bracovirus
- Cotesia glomerata bracovirus
- Cotesia hyphantriae bracovirus
- Cotesia kariyai bracovirus
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- Cotesia marginiventris bracovirus
- Cotesia melanoscela bracovirus
- Cotesia rubecula bracovirus
- Cotesia schaeferi bracovirus
- Cotia virus (CPV)
- Cotton leaf crumple virus
- Cotton leaf curl Alabad virus
- Cotton leaf curl Bangalore virus
- Cotton leaf curl Gezira virus
- Cotton leaf curl Kokhran virus
- Cotton leaf curl Multan virus
- Cowbone Ridge virus
- Cowpea aphid-borne mosaic virus
- Cowpea chlorotic mottle virus
- Cowpea golden mosaic virus
- Cowpea green vein banding virus
- Cowpea mild mottle virus
- Cowpea mosaic virus
- Cowpea mottle virus
- Cowpea severe mosaic virus
- Cowpea virus
- Cowpox virus
- Coxsackie virus
- CPV (cytoplasmic polyhedrosis virus)
- Cricetid herpesvirus 2
- Cricket paralysis virus
- Crimean-Congo hemorrhagic fever virus
- Crimean-Congo hemorrhagic fever virus
- Crimson clover latent virus
- Croton yellow vein mosaic virus
- Croup associated virus
- Cryphonectria hypovirus 1
- Cryphonectria hypovirus 2
- Cryphonectria hypovirus 3
- Cryphonectria hypovirus 4
- Cryphonectria mitovirus 1
- Crypotovirus
- Cryptophlebia leucotreta granulovirus
- Cryptosporidium parvum virus 1
- Cucumber Bulgarian virus
- Cucumber fruit mottle mosaic virus
- Cucumber green mottle mosaic virus
- Cucumber leaf spot virus
- Cucumber mosaic virus
- Cucumber necrosis virus
- Cucumber soil-borne virus
- Cucumber vein yellowing virus
- Cucumber yellows virus
- Cucumovirus
- Cucurbit aphid-borne yellows virus
- Cucurbit leaf crumple virus
- Cucurbit yellow stunting disorder virus
- Culex nigripalpus nucleopolyhedrovirus
- Cupixi virus
- Cycas necrotic stunt virus
- Cydia pomonella granulovirus
- Cymbidium mosaic virus
- Cymbidium ringspot virus
- Cypovirus
- Cypovirus 1
- Cypovirus 2
- Cypovirus 3
- Cypovirus 4
- Cypovirus 5
- Cypovirus 6
- Cypovirus 7
- Cypovirus 8
- Cypovirus 9
- Cypovirus 10
- Cypovirus 11
- Cypovirus 12
- Cypovirus 13
- Cypovirus 14
- Cypovirus 15
- Cypovirus 16
- Cyprinid herpesvirus 1
- Cyprinid herpesvirus 2
- Cyprinid herpesvirus 3
- Cypripedium virus Y
- Cytomegalovirus
- Cytomegalovirus group
- cytoplasmic polyhedrosis virus
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