Antiviral Agents/therapeutic use; Betacoronavirus/drug effects; Coronavirus Infections/drug therapy; Dietary Supplements; Influenza, Human/drug therapy; Interferon Type I/metabolism; Orthomyxoviridae/drug effects; Pneumonia, Viral/drug therapy; Animals; Antioxidants/therapeutic use; Antiviral Agents/adverse effects; Betacoronavirus/immunology; Betacoronavirus/pathogenicity; COVID-19; Coronavirus Infections/immunology; Coronavirus Infections/virology; Dietary Supplements/adverse effects; Enzyme Inhibitors/therapeutic use; Host Microbial Interactions; Humans; Hydrogen Peroxide/metabolism; Immunologic Factors/therapeutic use; Influenza, Human/immunology; Influenza, Human/virology; Interferon Type I/immunology; NADPH Oxidase 2/antagonists & inhibitors; NADPH Oxidase 2/metabolism; Orthomyxoviridae/immunology; Orthomyxoviridae/pathogenicity; Pandemics; Pneumonia, Viral/immunology; Pneumonia, Viral/virology; SARS-CoV-2; Toll-Like Receptor 7/metabolism; Virulence; COVID-19 Drug Treatment