Betacoronavirus/isolation & purification; Clinical Laboratory Techniques; Coronavirus Infections; Pandemics; Pneumonia, Viral; Viral Vaccines; Adenosine Monophosphate/analogs & derivatives; Adenosine Monophosphate/therapeutic use; Alanine/analogs & derivatives; Alanine/therapeutic use; Antibodies, Viral/analysis; Antiviral Agents/therapeutic use; Betacoronavirus/pathogenicity; COVID-19; COVID-19 Testing; COVID-19 Vaccines; Clinical Trials as Topic; Coronavirus Infections/diagnosis; Coronavirus Infections/drug therapy; Coronavirus Infections/epidemiology; Coronavirus Infections/prevention & control; Humans; Hydroxychloroquine/therapeutic use; Nucleic Acid Amplification Techniques; Pandemics/prevention & control; Pneumonia, Viral/diagnosis; Pneumonia, Viral/epidemiology; Pneumonia, Viral/prevention & control; SARS-CoV-2; COVID-19 Drug Treatment