Prophylaxis study using ivermectin and iota-carrageenan showing 0 of 788 cases from treated healthcare workers, compared to 237 of 407 control.
The authors later reported that carrageenan is not necessary in this protocol .
Carvallo et al., 11/17/2020, prospective, Argentina, South America, peer-reviewed, 4 authors, this trial uses multiple treatments in the treatment arm (combined with ivermectin) - results of individual treatments may vary.
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%), continuity correction due to zero event (with reciprocal of the contrasting arm).
This study is excluded in the after exclusion results of meta analysis: concern about potential data issues.
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.