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Factors linked to more-severe HRV or common cold infections
| Host characteristics | Immunologic status | Environment and lifestyle |
|---|---|---|
| Chronic lung disease | Low level of interferon responses | Exposed to tobacco smoke |
| Asthma | IFN-α | |
| COPD | IFN-β | Exposed to pollutants (NO2) |
| Cystic fibrosis | IFN-γ | |
| IFN-λ | Diet | |
| Age | Includes vitamin D | |
| Preschool child | Allergy | Includes probiotics |
| Elderly | Eosinophilia | |
| Stress | ||
| Genetics | Epithelial integrity | |
| Gender (young boys) | Immunocompromise |
