COVID-19 studies:  C19 studies: C19:  IvermectinIVM Vitamin DV.D HC QHC Q Vitamin CV.C ZincZn PVP-IPVP-I REGNREGN LY-CoVLY RemdesivirRMD
HCQ study #145 of 230
9/30 Post Exposure Prophylaxis study (treated after exposure to the virus)
Polat et al., Medical Journal of Bakirkoy, 16:3, 280-6, doi:10.5222/BMJ.2020.50469 (Peer Reviewed)
Hydroxychloroquine Use on Healthcare Workers Exposed to COVID-19 -A Pandemic Hospital Experience
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Small prophylaxis study of 208 healthcare workers in Turkey, 138 with high risk exposure received HCQ, while 70 with low and medium risk exposure did not. COVID-19 cases were lower in the treatment group, relative risk RR 0.43, p = 0.026. Since the control group had lower risk, the actual benefit may be larger.

Polat et al., 9/30/2020, prospective, Turkey, Middle East, peer-reviewed, 3 authors.
risk of COVID-19 case, 57.0% lower, RR 0.43, p = 0.03, treatment 12 of 138 (8.7%), control 14 of 70 (20.0%).
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