Adrenal Cortex Hormones/therapeutic use; Anti-Asthmatic Agents/therapeutic use; Asthma/drug therapy; Coronavirus Infections/prevention & control; Cytokine Release Syndrome/prevention & control; Dexamethasone/therapeutic use; Pandemics/prevention & control; Pneumonia, Viral/prevention & control; Administration, Inhalation; Angiotensin-Converting Enzyme 2; Asthma/immunology; Asthma/pathology; Asthma/virology; Betacoronavirus/drug effects; Betacoronavirus/immunology; Betacoronavirus/pathogenicity; COVID-19; Coronavirus Infections/immunology; Coronavirus Infections/pathology; Coronavirus Infections/virology; Cytokine Release Syndrome/immunology; Cytokine Release Syndrome/pathology; Cytokine Release Syndrome/virology; Endoribonucleases/antagonists & inhibitors; Endoribonucleases/genetics; Endoribonucleases/immunology; Gene Expression Regulation/drug effects; Host-Pathogen Interactions/drug effects; Host-Pathogen Interactions/genetics; Host-Pathogen Interactions/immunology; Humans; Interleukin-6/antagonists & inhibitors; Interleukin-6/genetics; Interleukin-6/immunology; Interleukin-8/antagonists & inhibitors; Interleukin-8/genetics; Interleukin-8/immunology; Peptidyl-Dipeptidase A/genetics; Peptidyl-Dipeptidase A/immunology; Pneumonia, Viral/immunology; Pneumonia, Viral/pathology; Pneumonia, Viral/virology; Receptors, Virus/antagonists & inhibitors; Receptors, Virus/genetics; Receptors, Virus/immunology; SARS-CoV-2; Serine Endopeptidases/genetics; Serine Endopeptidases/immunology; Severity of Illness Index; Tumor Necrosis Factor-alpha/antagonists & inhibitors; Tumor Necrosis Factor-alpha/genetics; Tumor Necrosis Factor-alpha/immunology; Viral Nonstructural Proteins/antagonists & inhibitors; Viral Nonstructural Proteins/genetics; Viral Nonstructural Proteins/immunology