1) Mortality on discharge from the Hospital (Proportion of patients who die (global and by strata: serious and critical) according to their causes and treatment groups; during their stay at the CMN Siglo XXI Specialty Hospital). Measurement time: during hospital stay. 2) Need for invasive mechanical ventilation (orotracheal intubation) in critically ill patients and; time (in days) from intubation to weaning in critically ill (if applicable) and critical patients. Measurement time: During the stay in the COVID-19 internment area; until ventilatory weaning.

1) Mortality on discharge from the Hospital (Proportion of patients who die (global and by strata: serious and critical) according to their causes and treatment groups; during their stay at the CMN Siglo XXI Specialty Hospital). Measurement time: during hospital stay. 2) Need for invasive mechanical ventilation (orotracheal intubation) in critically ill patients and; time (in days) from intubation to weaning in critically ill (if applicable) and critical patients. Measurement time: During the stay in the COVID-19 internment area; until ventilatory weaning.