A nice bit of research here:
Chloroquine/SARS study doesn’t prove hydroxychloroquine works against COVID-19
CLAIM: A 2005 study that found that “Chloroquine is a potent inhibitor of SARS coronavirus infection and spread” proves that hydroxychloroquine is effective against COVID-19. AP’S ASSESSMENT: False. The study does not prove that the malaria drug hydroxychloroquine is effective against...
apnews.com