100% reduction in cases with HCQ+zinc post-exposure prophylaxis. Brief report for healthcare workers in Bulgaria.
0 cases with treatment vs. 3 for control.
156 treatment patients and 48 control patients.
No serious adverse events. This paper reports on both PEP and early treatment, we have separated the two studies.
Simova et al., 11/12/2020, retrospective, Bulgaria, Europe, peer-reviewed, 5 authors.
risk of COVID-19 case, 92.7% lower, RR 0.07, p = 0.01, treatment 0 of 156 (0.0%), control 3 of 48 (6.2%), 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.