HCQ Fails to Prevent COVID-19 Mounting evidence shows that HCQ is ineffective in COVID-19 infection; and now the NEJM reports that HCQ given as post-COVID exposure therapy failed to prevent SARS-CoV-2 infection or symptomatic Covid-19 in healthy persons. https://t.co/lt71GAtL3D https://t.co/VzmJgQlrrG