CI

At a glance

ClinicalIndex Comparison Record
Phase 2Completed· 295 enrolled
Drug / intervention
casirivimab+imdevimab +1 moredrug
Likely dose
Not stated in record
Structured eligibility isn't available for this trial yet — see the full criteria in the Eligibility tab below.

Standardized by ClinicalIndex from the ClinicalTrials.gov record · verify against the source.

Search/NCT04852978
NCT04852978Phase 2Completed

A Phase 2 Randomized, Open-Label, Parallel Group Study to Assess the Immunogenicity, Safety, and Tolerability of Moderna mRNA-1273 Vaccine Administered With Casirivimab+Imdevimab in Healthy Adult Volunteers

Regeneron Pharmaceuticals·interventional·Posted Apr 21, 2021·Updated Oct 20, 2025

In Brief

A Phase 2 clinical trial evaluating casirivimab+imdevimab and Moderna mRNA-1273 vaccine for Healthy and Chronic Stable Illness. Completed, enrolled 295 participants across 6 sites.

Detailed Summary

The primary objectives of the study are: * To evaluate the extent of effect, if any, of REGN10933+REGN10987 administration on vaccine-induced neutralizing antibody responses to SARS-CoV-2 by Moderna mRNA-1273 * To evaluate the time interval required between REGN10933+REGN10987 administration and Moderna mRNA-1273 vaccination, to ensure no meaningful impact on vaccine-induced neutralizing antibody responses to SARS-CoV-2 The secondary objectives of the study are: * To quantify the alteration of antigen specificity of vaccine-induced SARS-CoV-2 antibody responses when administered with different dose regimens of REGN10933+REGN10987 * To evaluate the safety and tolerability of REGN10933+REGN10987 and Moderna mRNA-1273 vaccine when administered in close succession * To assess the concentrations of REGN10933 and REGN10987 in serum over time in participants who receive REGN10933+REGN10987 and Moderna mRNA-1273 vaccine * To evaluate the immunogenicity of REGN10933 and REGN10987 over time

Study Details

Study Typeinterventional
Allocation--
Masking--
Primary Purpose--
CountriesUnited States
Collaborators--

Timeline

Phase 2CompletedFinished
20222023202420252026
First PostedApr 21, 2021
Enrollment StartApr 29, 2021
Primary CompletionNov 21, 2022
TodayJul 2, 2026
Enrollment to primary: 1.6 yearsPosted 5.2 years ago

Interventions

casirivimab+imdevimabdrug

Wave 1 Intravenous (IV) administration Wave 2 Subcutaneous administration

Moderna mRNA-1273 vaccinebiological

Single intramuscular (IM) injection