COVID-19 studies:  C19 studies: C19:  IvermectinIVM Vitamin DV.D PXPX FLVFLV PVP-IPI BUBU BHBH BLBL CICI HC QHC Q NZNZ COCO More..
Zinc study #15 of 16
4/14 Post Exposure Prophylaxis study (treated after exposure to the virus)
Seet et al., International Journal of Infectious Diseases, doi:10.1016/j.ijid.2021.04.035 (Peer Reviewed)
Positive impact of oral hydroxychloroquine and povidone-iodine throat spray for COVID-19 prophylaxis: an open-label randomized trial
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Prophylaxis RCT in Singapore with 3,037 low risk patients, showing lower serious cases, lower symptomatic cases, and lower confirmed cases of COVID-19 with all treatments (ivermectin, HCQ, PVP-I, and Zinc + vitamin C) compared to vitamin C.
Meta-analysis of vitamin C in 6 previous trials shows a benefit of 16%, so the actual benefit of ivermectin, HCQ, and PVP-I may be higher. Cluster RCT with 40 clusters.
There were no hospitalizations and no deaths. NCT04446104.

Seet et al., 4/14/2021, Cluster Randomized Controlled Trial, Singapore, Asia, peer-reviewed, 15 authors, this trial compares with another treatment - results may be better when compared to placebo.
risk of COVID-19 severe case, 49.7% lower, RR 0.50, p = 0.03, treatment 33 of 634 (5.2%), control 64 of 619 (10.3%).
risk of COVID-19 case, 26.9% lower, RR 0.73, p = 0.03, treatment 300 of 634 (47.3%), control 433 of 619 (70.0%), adjusted per study, odds ratio converted to relative risk, model 6.

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 16 studies
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