Advances in the use of chloroquine and hydroxychloroquine for the treatment of COVID-19 J. SUN ET AL. POSTGRADUATE MEDICINE Abstract ABSTRACT Coronavirus Disease 2019 (COVID-19), caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), is spreading worldwide. Antiviral therapy is the most important treatment for COVID-19. Among the drugs under investigation, anti-malarials, chloroquine (CQ) and hydroxychloroquine (HCQ), are being repurpos