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ARCT-154 Self-Amplifying RNA SARS-CoV-2 Vaccine

Phase 2

COVID-19 Vaccines | Vaccine | Infectious Disease |Arcturus Therapeutics Holdings Inc.|Trials Updated: Nov 6, 2025

ARCT-154 Self-Amplifying RNA SARS-CoV-2 Vaccine development status

Highest phase Phase 2
Registered trials 1 across 1 sponsor since Aug 2001

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials1
Total Enrollment19,474

FDA Designations

No designations recorded

ARCT-154 Self-Amplifying RNA SARS-CoV-2 Vaccine clinical trials

ARCT-154 Self-Amplifying RNA SARS-CoV-2 Vaccine · 1 trial · 1 indication

Phase 2 1
NCT05012943The ARCT-154 Self-Amplifying RNA Vaccine Efficacy Study (ARCT-154-01)COVID-19 Vaccines
COMPLETED19,474 Analytics
PHASE2COMPLETED
The ARCT-154 Self-Amplifying RNA Vaccine Efficacy Study (ARCT-154-01)
COVID-19 VaccinesUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of Participants Reporting Solicited Local Adverse Reactions (ARs)
Within 7 days after Dose 1 and Dose 2 (up to Day 7 and 36)

Solicited local ARs included injection site erythema, injection site pain, injection site induration/swelling, and injection site tenderness. A summary of serious and all other non-serious adverse events regardless of causality is located in the Reported Adverse Events module.

Number of Participants Reporting Solicited Systemic ARs
Within 7 days after Dose 1 and Dose 2 (up to Day 7 and 36)

Solicited systemic ARs included arthralgia, chills, diarrhea, dizziness, fatigue, fever (categorized by measured body temperature), headache, myalgia, and nausea/vomiting. A summary of serious and all other non-serious adverse events regardless of causality is located in the Reported Adverse Events module.

Number of Participants Reporting Unsolicited Adverse Events (AEs)
Approximately 28 days after Dose 1 and Dose 2 (Day 1 to Day 29 and Day 29 to Day 57)

Unsolicited AEs were defined as any spontaneously reported or discovered AE. A summary of serious and all other non-serious adverse events regardless of causality is located in the Reported Adverse Events module.

Number of Participants Reporting Medically Attended Adverse Events (MAAEs), Serious Adverse Events (SAEs) and AEs Leading to Discontinuation
Day 1 to Day 92

An MAAE was defined as an AE that led to an unscheduled visit (including a telemedicine visit) with a healthcare provider (\[HCP\], e.g., nurse, nurse practitioner, physician's assistant, physician). An SAE was defined as any event that resulted in death, was immediately life-threatening, required inpatient hospitalization or prolongation of existing hospitalization, resulted in persistent or significant disability/incapacity or was a congenital anomaly/birth defect arising from a pregnancy conceived after receipt of study vaccine. A summary of serious and all other non-serious adverse events regardless of causality is located in the Reported Adverse Events module.

Number of Participants With Neutralizing Antibody (NAb) Responses
Day 57

Data are presented for the number of participants with a NAb seroconversion response as determined by the surrogate virus neutralization test (sVNT). Seroconversion was defined as a ≥4-fold increase in antibody concentration from baseline.

Number of Participants With a First Occurrence of Coronavirus Disease 2019 (COVID-19)
Day 36 to Day 92

COVID-19 was defined as a positive SARS-CoV-2 test and at least one of the following that was a new or worsening finding: ⦁ Fever or chills ⦁ Cough ⦁ Shortness of breath or difficulty breathing ⦁ Fatigue ⦁ Muscle or body aches ⦁ Headache ⦁ New loss of taste or smell ⦁ Sore throat ⦁ Congestion or runny nose ⦁ Nausea or vomiting ⦁ Diarrhea Data are presented for the number of participants with a first occurrence of COVID-19 with no evidence of prior infection.

Secondary Endpoints

Geometric Mean Titers of SARS-CoV-2 Neutralizing Antibodies
Days 1, 29, 57 and 92
Geometric Mean Fold Rise in SARS-CoV-2 Neutralizing Antibody Titers
Days 29, 57, 92
Number of Participants Seroconverting for Neutralizing Antibodies
Days 29, 57 and 92
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Study Design & Arms

AllocationRANDOMIZED
MaskingTRIPLE
ModelPARALLEL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
ARCT-154EXPERIMENTALEach participant is planned to receive a two-dose vaccination series of ARCT-154 at a dose of 5 µg with 28 day interval in the first vaccination series.
PlaceboPLACEBO_COMPARATOREach participant is planned to receive a two-dose vaccination series of placebo (normal saline) with 28 day interval in the first vaccination series.
Astra Zeneca COVID-19 vaccineACTIVE_COMPARATOREach participant is planned to receive a two-dose vaccination series of Astra Zeneca COVID-19 vaccine with 28 day interval in the first vaccination series.

Interventions

NameTypeDescription
ARCT-154 Self-Amplifying RNA SARS-CoV-2 VaccineBIOLOGICALARCT-154 Self-Amplifying RNA SARS-CoV-2 Vaccine
Placebo (normal saline)OTHERNormal saline with the same volume as of ARCT-154
Astra Zeneca COVID-19 vaccineBIOLOGICALAstra Zeneca COVID-19 vaccine (ChAdOx1 nCoV-19)
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Eligibility Criteria

Age Range18 Years to 100 Years
SexALL
Healthy VolunteersYes
Study Sites3

Inclusion Criteria: Individuals who: 1. are able to provide consent 2. agree to comply with all study visits and procedures 3. are of childbearing potential and sexually active must be willing to adhere to contraceptive requirements 4. are male or female ≥18 years of age (or, for Phase 1, 18 to \<...

Countries:Vietnam
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Frequently asked questions about ARCT-154 Self-Amplifying RNA SARS-CoV-2 Vaccine

What is ARCT-154 Self-Amplifying RNA SARS-CoV-2 Vaccine?

ARCT-154 is an investigational vaccine developed by Arcturus Therapeutics Holdings Inc. for the prevention of COVID-19. It uses self-amplifying RNA technology and is designed to stimulate an immune response against SARS-CoV-2. The vaccine has been studied in a Phase 2 clinical trial.

What is ARCT-154 Self-Amplifying RNA SARS-CoV-2 Vaccine used for?

ARCT-154 is being developed for the prevention of COVID-19, which is caused by the SARS-CoV-2 virus. It is intended for use in adults 18 years of age and older. The vaccine is designed to elicit an immune response that may protect against COVID-19.

Who is developing ARCT-154 Self-Amplifying RNA SARS-CoV-2 Vaccine?

ARCT-154 is being developed by Arcturus Therapeutics Holdings Inc., a biopharmaceutical company. The company's ticker symbol is ARCT. Arcturus specializes in mRNA medicines and vaccines.

What phase is ARCT-154 Self-Amplifying RNA SARS-CoV-2 Vaccine in?

ARCT-154 is in Phase 2 clinical development. It has not been approved by the FDA or any regulatory agency. The vaccine is still being evaluated in clinical trials to assess its safety and efficacy.

What clinical trials is ARCT-154 Self-Amplifying RNA SARS-CoV-2 Vaccine in?

ARCT-154 has been studied in a Phase 2 clinical trial, NCT05012943, titled 'The ARCT-154 Self-Amplifying RNA Vaccine Efficacy Study (ARCT-154-01)'. This completed trial enrolled 19,474 participants in Vietnam. It was randomized, double-blind, and placebo-controlled.