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Factors Affecting Survival of Viruses in Nature
| Factor | Example |
|---|---|
| Population size | Canine distemper virus |
| Respiratory viruses | |
| Virulence and transmissiblity | Myxoma virus |
| Antigenic variation | Influenza viruses |
| Foot-and-mouth disease viruses | |
| Subclinical infections | Enteroviruses, many others |
| Persistent infections | Herpesviruses |
| Vertical transmission | Retroviruses |
| Reservoir hosts | Alphaviruses |
| Resistant virus | Parvoviruses |
