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Casirivimab/imdevimab study #6 of 8
4/12 Post Exposure Prophylaxis study (treated after exposure to the virus)
Regeneron Press Release (Preprint)
Phase 3 prevention trial showed 81% reduced risk of symptomatic SARS-CoV-2 infections with subcutaneous administration of REGEN-COV™ (casirivimab and imdevimab)
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Press release for a phase 3 prophylaxis trial reporting lower hospitalization/ER and symptomatic cases, and faster recovery with 1,200mg subcutaneous casirivimab with imdevimab.

Regeneron et al., 4/12/2021, Double Blind Randomized Controlled Trial, preprint, 1 author.
risk of hospitalization/ER, 88.9% lower, RR 0.11, p = 0.06, treatment 0 of 753 (0.0%), control 4 of 752 (0.5%), continuity correction due to zero event (with reciprocal of the contrasting arm), day 29.
risk of symptomatic case, 81.4% lower, RR 0.19, p < 0.001, treatment 11 of 753 (1.5%), control 59 of 752 (7.8%), day 29.
recovery time, 62.5% lower, relative time 0.37, p < 0.001, treatment 753, control 752, relative time with symptoms.
time to viral-, 69.2% lower, relative time 0.31, p < 0.001, treatment 753, control 752, relative time with high viral load.

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.
All 8 studies
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