Research in the virology of COVID-19 encompasses several primary areas of study. These include understanding the physical structure of SARS-CoV-2, its classification among coronaviruses, and its continuous evolution and mutations. Key focuses also involve the mechanisms of host cell infection, the stability of the virus in various environmental conditions, and the potential for patient reinfection. Furthermore, applied research areas include antigen detection methods, animal studies on the virus, and the development of vaccine candidates to build adaptive immunity.