COVID-19 studies:  C19 studies: C19:  IvermectinIVM Vitamin DV.D HC QHC Q Vitamin CV.C ZincZn PVP-IPVP-I FLVFLV REGNR2 LY-CoVLY RemdesivirRMD
HCQ study #169 of 260
10/27 Pre-Exposure Prophylaxis study (treated before exposed to the virus)
Arleo et al., medRxiv, doi:10.1101/2020.10.26.20219154 (Preprint)
Clinical Course and Outcomes of coronavirus disease 2019 (COVID-19) in Rheumatic Disease Patients on Immunosuppression: A case Cohort Study at a Single Center with a Significantly Diverse Population
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Retrospective hospitalized rheumatic disease patients showing 50% lower mortality for patients on HCQ.

Arleo et al., 10/27/2020, retrospective, USA, North America, preprint, 5 authors.
risk of death, 50.0% lower, RR 0.50, p = 0.67, treatment 1 of 20 (5.0%), control 5 of 50 (10.0%), all patients.
risk of death, 52.0% lower, RR 0.48, p = 0.64, treatment 1 of 10 (10.0%), control 5 of 24 (20.8%), inpatients.

Effect extraction follows pre-specified rules prioritizing more serious outcomes. For an individual study the most serious outcome may have a smaller number of events and lower statistical signficance, however this provides the strongest evidence for the most serious outcomes when combining the results of many trials.
Details of all 260 studies    Meta analysis
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