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| Age > 65 years |
| Obesity |
| Systemic arterial hypertension |
| Diabetes mellitus |
| Smoking |
| Heart failure |
| Chronic obstructive pulmonary disease |
| Chronic kidney disease |
| Sickle cell anemia |
| Continuous immunosuppression (transplants, HIV infection, oncological diseases, chronic use of immunosuppressants) |
| Asthma (moderate to severe) |
| Cerebrovascular disease |
| Pregnancy |
| Liver disease |
