CI

At a glance

ClinicalIndex Comparison Record
Phase 3Completed· 1,514 enrolled
Drug / intervention
ARCT-2303 +3 morebiological
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/NCT06279871
NCT06279871Phase 3Completed

A Phase 3, Multicenter, Observer-blind, Randomized, Controlled Study to Evaluate the Immunogenicity, Reactogenicity, and Safety of a Self-Amplifying RNA COVID-19 Vaccine (ARCT-2303), Administered Concomitantly With Quadrivalent Influenza Vaccines, in Adults

Arcturus Therapeutics, Inc.·interventional·Posted Feb 28, 2024·Updated Dec 12, 2025

In Brief

A Phase 3 clinical trial evaluating ARCT-2303, Influenza vaccine, and 2 other interventions for COVID-19. Completed, enrolled 1,514 participants across 29 sites in 4 countries.

Detailed Summary

This is a multicenter, observer-blind, randomized, controlled phase 3 study to evaluate the immunogenicity, reactogenicity, and safety of an investigational self-amplifying RNA COVID-19 vaccine (ARCT-2303) administered concomitantly with quadrivalent influenza vaccines or standalone in adults who previously received authorized COVID-19 vaccine.

Study Details

Study Typeinterventional
Allocation--
Masking--
Primary Purpose--
ConditionsCOVID-19
CountriesAustralia, Costa Rica, Honduras, Philippines

Timeline

Phase 3CompletedFinished
20252026
First PostedFeb 28, 2024
Enrollment StartMar 27, 2024
Primary CompletionOct 9, 2024
Study CompletionNov 21, 2024
TodayJul 2, 2026
Enrollment to primary: 6 monthsPosted 2.3 years ago

Interventions

ARCT-2303biological

Self-Amplifying RNA COVID-19 vaccine (Omicron XBB.1.5)

Influenza vaccinebiological

Licensed cell-based influenza vaccine

Influenza vaccine, adjuvantedbiological

Licensed influenza vaccine, adjuvanted

Placeboother

0.9% saline