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Ivermectin study #31 of 63
11/17 Prophylaxis study
Carvallo et al., Journal of Biomedical Research and Clinical Investigation, doi:10.31546/2633-8653.1007 (Peer Reviewed)
Study of the Efficacy and Safety of Topical Ivermectin + Iota-Carrageenan in the Prophylaxis against COVID-19 in Health Personnel
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Prophylaxis study using ivermectin and carrageenan showing 0 of 788 cases from treated healthcare workers, compared to 237 of 407 control.
The effect is likely to be primarily due to ivermectin - the author has later reported that carrageenan is not necessary [1].

Carvallo et al., 11/17/2020, prospective, Argentina, South America, peer-reviewed, 4 authors, dosage 12mg weekly.
risk of COVID-19 case, 99.9% lower, RR 0.001, p < 0.001, treatment 0 of 788 (0.0%), control 237 of 407 (58.2%).

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.
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