| Table 2: Main air-borne viral infections and seasonal distribution | |
| Virus | Season (in temperate climates) |
| Coronavirus | More often in winter and spring (December-May) |
| Parainfluenza viruses | Vary in their seasonal epidemiology by type |
| Respiratory syncytial virus | October-January |
| Metapneumovirus | Late winter and early spring (peak in March) |
| Influenza | Almost exclusively in the winter (November-March in the northern hemisphere, May-September in the southern hemisphere) |
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