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Ivermectin study #19 of 65
10/19 Prophylaxis study
Carvallo et al., NCT04425850 (Preprint)
Usefulness of Topic Ivermectin and Carrageenan to Prevent Contagion of Covid 19 (IVERCAR)
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Prophylaxis study using ivermectin and carrageenan showing 0 of 131 cases from treated healthcare workers, compared to 11 of 98 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., 10/19/2020, prospective, Argentina, South America, preprint, 1 author, dosage 1mg days 1-14.
risk of COVID-19 case, 96.3% lower, RR 0.04, p < 0.001, treatment 0 of 131 (0.0%), control 11 of 98 (11.2%), continuity correction due to zero event (with reciprocal of the contrasting arm).

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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