- S -
- Sabia virus
- Salisbury common cold virus
- Salisbury common cold viruses
- salivary gland virus (SGV)
- salivary virus
- San Miguel sea lion virus
- sandfly fever virus
- Semliki Forest virus
- Sendai virus
- Seoul virus
- serum hepatitis virus
- sheep-pox virus
- shipping fever virus
- Shope fibroma virus
- Shope papilloma virus
- Simbu virus
- simian immunodeficiency virus (SIV)
- simian sarcoma virus (SSV)
- simian vacuolating virus No. 40
- simian virus (SV)
- simian virus 40
- Sin Nombre virus
- Sindbis virus
- slow virus
- smallpox virus
- snowshoe hare virus
- soremouth virus
- Spondweni virus
- St. Louis encephalitis virus (SLEV)
- street virus
- Sudan virus
- swamp fever virus
- swine encephalitis virus
- swine fever virus
- swine influenza virus
- swinepox virus
- Swiss mouse leukemia virus
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