- C -
- C group virus
- C virus
- CA virus
- Cache Valley virus
- California encephalitis virus
- California myxoma virus
- California virus
- canarypox virus
- canine distemper virus
- Capim virus
- Caraparu virus
- cat distemper virus
- cattle plague virus
- Catu virus
- CELO virus
- Central European encephalitis virus (CEEV)
- Central European tick-borne encephalitis virus
- Chagres virus
- chicken embryo lethal orphan virus
- chickenpox virus
- chikungunya fever virus
- chikungunya virus
- Coe virus
- cold virus
- Colorado tick fever virus
- Columbia S.K. virus
- common cold virus
- contagious ecthyma (pustular dermatitis) virus of sheep
- contagious pustular stomatitis virus
- coryza virus
- cowpox virus
- Coxsackie B virus
- Crimean hemorrhagic fever virus
- Crimean-Congo hemorrhagic fever virus
- croup-associated virus
- cytomegalic inclusion disease virus
- cytopathogenic virus
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