Researchers at Case Â鶹ӳ» have added to the growing body of understanding Â鶹ӳ» how hydroxychloroquine (HCQ) is not a possible defense against COVID-19. Specifically, they found that HCQ is not effective in preventing COVID-19 in patients with lupus and rheumatoid arthritis (RA), suggesting a broader interpretation of HCQ as ineffective preventive medicine for the general population.