Based on adoption and early outpatient use of the current best treatment when it was known to be effective from multiple studies at p = 0.01 (ivermectin from Sep 30, 2020, and HCQ from May 19, 2020), and adjusting for the estimated fraction of the world that adopted these treatments. The total number of COVID-19 deaths is .

There have been 42 controlled studies of ivermectin for COVID-19, authored by 331 scientists, with 14,906 patients. Meta analysis shows a 83% improvement for early treatment, relative risk 0.17 [0.11-0.28].

There have been 210 controlled studies of HCQ for COVID-19, authored by 3,270 scientists, with 186,848 patients. Meta analysis shows a 66% improvement for early treatment, relative risk 0.34 [0.27-0.44] (HCQ is not effective when used too late).

Many other early treatments are effective, for example vitamin D and bamlanivimab (LY-CoV555). Using multiple treatments, especially with different mechanisms of action, is likely to further reduce deaths.