Meta analysis of prophylactic and early treatment RCTs, 24% reduction in cases, hospitalization or death with HC Q, RR 0.76, p=0.025. No serious adverse cardiac events were reported. 5,577 patients.The Boulware study provides a breakdown for treatment delay. For the case of < ~4 days (2 days enrollment, ~46 hours shipping), the result of the meta analysis becomes RR 0.68, p=0.0097.The actual effect may be larger due to treatment delays, followup loss, protocol deviation, active placebos, no severity analysis for cases, and suboptimal regimens.For the individual studies see [1, 2, 3, 4, 5].