Coronavirus disease 2019 (COVID-19) is an emerging infectious disease caused by the novel severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). COVID-19 is currently still a global pandemic. The wonderful news is that the FDA has approved several vaccines and these vaccines are highly effective. However, a large population has not been vaccinated. Furthermore, it is clear now that the virus mutates quickly and the current vaccines are less effective for the virus variants (e.g., the Delta variant). Therefore, non-vaccine treatment options are still needed.