No no no no. That's not a trial, it's not peer-reviewed, and they are just saying that for people with COVID19 the addition of zinc to hydroxychloroquine and azithromycin might be better than hydroxychloroquine and azithromycin alone (which seems to have no benefit). This says nothing about hydroxychloroquine being prophylactic, or safe. From a peer-reviewed study published in JAMA last week: https://jamanetwork.com/journals/jama/fullarticle/2766117 ... To our knowledge, this study is the largest report of adverse effects of hydroxychloroquine among patients with COVID-19. Cardiac arrest was more frequent in patients who received hydroxychloroquine with azithromycin, compared with patients who received neither drug, even after adjustment.Among patients hospitalized in metropolitan New York with COVID-19, treatment with hydroxychloroquine, azithromycin, or both, compared with neither treatment, was not significantly associated with differences in in-hospital mortality.