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Estimated annual proportion of clinical case based on virus' type.
| Virus's type | Estimated annual proportion of cases |
|---|---|
| Rhinovirus | 30–50% |
| Coronavirus | 10–15% |
| Influenza virus | 5–15% |
| Respiratory syncytial virus | 5% |
| Parainfluenza virus | 5% |
| Adenovirus | <5% |
| Enterovirus | <5% |
| Metapneumovirus | Unknown |
| Unknown | 20–30% |
