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Risk factors influencing the incidence and severity of viral respiratory tract infection in infants and children
| Age, immunologic experience |
| Prematurity, low birth weight |
| Chronic cardiopulmonary diseases |
| Immunodeficiency syndromes |
| Malnutrition |
| Exposure |
| Other children in family |
| Crowding |
| Care setting, family versus day care |
| Environmental pollution, parental smoking |
| Lack of breast-feeding |
