Betacoronavirus/immunology, Coronavirus Infections/epidemiology, Pneumonia, Viral/epidemiology, Pandemics/prevention & control, Epidemiological Monitoring, Health Systems/organization & administration, Coronavirus Infections/drug therapy, Pneumonia, Viral/drug therapy, Chloroquine/therapeutic use, Coronavirus Infections/prevention & control, Pneumonia, Viral/prevention & control, Clinical Protocols, Dexamethasone/therapeutic use, Coronavirus Infections/immunology, Pneumonia, Viral/immunology, Viral Vaccines/immunology, Clinical Trial, Health Equity, Americas/epidemiology, Social Isolation, Masks, Hospital Bed Capacity, Intensive Care Units, Influenza, Human/immunology, Influenza Vaccines/immunology, Risk Groups, Health Promotion, Hypertension/prevention & control, COVID-19, Ghebreyesus, Tedros Adhanom, Covax