The Italian Society for Rheumatology studied 65,000 patients on longterm hydroxychloroquine for RA and Lupus.
Only 20 patients tested positive for COVID-19. No ICU, no deaths.
This is a 90% reduction in infection rate compared to the rest of Italy
For now, in support of this "prophylaxis" effect, there is a recent publication, involving 211 people. It was published in the International Journal of Antimicrobial Agents, the official body of the International Society of Antimicrobial Chemotherapy. Of 211 people exposed to Covid19 positive individuals and subjected to prophylaxis with hydroxychloroquine, none were infected.
Well, maybe ol T-Rump may be on to something after all.....
Not really, Taking any antivirals would do the same. A true test would be hydroxychloroquine vs other antivirals. Which does the least harm.