A Study to Characterize the Safety and Immunogenicity of AZD6489 in Participants 60 Years of Age and Older (ARIES) (ARIES)

A Phase I/II, Randomized, Double-Blind, Active-Controlled Study to Characterize the Safety and Immunogenicity of AZD6489 in Adults 60 Years of Age and Older

This Phase I/II study is to characterize the safety and immunogenicity of 2 dose levels of AZD6489, an investigational RSV recombinant prefusion F protein VLP vaccine.

Study Overview

• Status: Recruiting
• Conditions: RSV Respiratory Syncytial Virus
• Intervention / Treatment: Biological: AZD6489; Biological: Licensed RSV vaccine #1; Biological: Licensed RSV vaccine #2

Detailed Description

This Phase I/II clinical study will be conducted in the US at approximately 5 sites. The study is a randomized, double-blind, active-controlled study to characterize the safety and immunogenicity of a single dose of AZD6489 in adults ≥ 60 years of age. Two dose levels of AZD6489 will be assessed.

Approximately 160 participants will be randomized and stratified by age group and previous receipt of RSV vaccine. Participants will be randomized/dosed to receive AZD6489, licensed RSV vaccine #1, or licensed RSV vaccine #2. The study is split into 2 cohorts based on the 2 dose levels of AZD6489 being studied.

For each cohort, an initial sentinel group of 8 participants will be followed up for safety via a telephone or teleconference call, approximately 48 hours post-study intervention, and the safety data will be evaluated by the SRC in order to provide a recommendation to continue randomization and vaccination for the remaining participants in that cohort.

An ESDR of all available safety data through 7 days post-vaccination of Cohort 1 will be conducted. Randomization of Cohort 2 will be allowed only after the ESDR of Cohort 1 participants has been completed and the results support that the safety profile is acceptable.

This study includes 5 in-clinic study visits. The duration of each participant's involvement in the study will be approximately 12 months following the administration of study intervention. Safety will be assessed for the duration of the study. Blood will be taken for immunological and safety assessments as per SoA.

• Study Type: Interventional
• Enrollment (Estimated): 160
• Phase: Phase 2; Phase 1

Contacts and Locations

• Study Contact: Name: AstraZeneca Clinical Study Information Center; Phone Number: 1-877-240-9479; Email: information.center@astrazeneca.com

Study Locations

• United States
  • California
    • Long Beach, California, United States, 90815
      • Recruiting
      • Research Site
    • Rolling Hills Estates, California, United States, 90274
      • Recruiting
      • Research Site
  • Illinois
    • Chicago, Illinois, United States, 60640
      • Recruiting
      • Research Site
  • Kansas
    • Lenexa, Kansas, United States, 66219
      • Recruiting
      • Research Site
  • Missouri
    • Kansas City, Missouri, United States, 64114
      • Recruiting
      • Research Site
  • Nebraska
    • Omaha, Nebraska, United States, 68134
      • Recruiting
      • Research Site

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: Yes

Description

Inclusion Criteria:

• Participant must be ≥ 60 years of age at the time of signing the informed consent.
• Participants who are medically stable in the opinion of the Investigator at the time of study intervention. Participants with chronic stable medical conditions with or without specific treatment, such as diabetes, hypertension, or cardiac disease, are allowed to participate in this study if considered by the Investigator as medically stable.
• Able to understand and comply with study requirements/procedures including attending all scheduled study visits (if applicable, with assistance by caregiver, surrogate, or legally authorized representative or equivalent representative as locally defined) based on the assessment of the Investigator.
• Capable of giving signed informed consent as described in Appendix A 3 which includes compliance with the requirements and restrictions listed in the ICF and in this protocol.

Exclusion Criteria:

• Previous known laboratory-confirmed RSV infection within 6 months of Visit 1.
• Moderate to severe acute (time-limited) or any febrile (temperature ≥ 38.0 °C [100.4 ºF]) illness/infection within 3 days of Visit 1; participants excluded for transient acute illness may be rescreened once and vaccinated if the illness has resolved.
• History of a clinically significant bleeding disorder contraindicating IM injections or venipuncture based on Investigator judgment.
• History of hypersensitivity to any component of the study interventions.
• History of severe adverse reaction or severe allergic reaction (eg, anaphylaxis) associated with any vaccine.
• Known chronic hepatitis B or C.
• Known or suspected congenital or acquired immunodeficiency.
• History of Guillain-Barré syndrome or any other demyelinating condition.
• Current or previous (within the past 5 years) history of any malignancy (except treated non-melanoma skin cancers, locally treated cervical cancer, or prostate cancer that is stable at the time of vaccination in the absence of therapy).
• Chronic illness that, in the opinion of the Investigator, is at a stage where it might interfere with study conduct or completion.
• Receipt of any licensed or investigational RSV vaccine within 2 years prior to Visit 1, or planned receipt during the study.
• Receipt of any licensed vaccine (including licensed influenza or COVID-19 vaccines) within 28 days prior to Visit 1 or expected receipt prior to end of Visit 3 assessments.
• Receipt of immunoglobulin or blood products within 3 months prior to Visit 1, or planned receipt during the study.
• Receipt of immune-modifying drugs or immunosuppressive therapy (eg, anti-cancer chemotherapy, anti-cytokine therapy, or radiation therapy) within 6 months prior to Visit 1, or planned receipt during study.
• Long-term systemic corticosteroid therapy (prednisone or equivalent at a dose of ≥ 20 mg daily or every other day for more than 2 consecutive weeks) within 6 months prior to Visit 1 or planned receipt during study. Topical/inhaled/intra-articular/ophthalmic/otic steroids or short-term oral steroids are permitted.
• Receipt of allergen immunotherapy if dose has been escalated or reduced within 30 days of Visit 1. Allergen immunotherapy is allowed if participant is receiving stable desensitization therapy for at least 30 days prior to Visit 1 and there is no anticipated change before Visit 3.
• Participation in another clinical study with a study intervention administered in the preceding 90 days (or preceding 6 months for extended half-life drug products) or expected receipt of another study intervention during the study, or concurrent participation in another interventional study. Individuals who are in a prolonged post-administration observation period of another investigational, marketed drug, or non-interventional clinical study, for which there is no ongoing exposure to the investigational or marketed product and all scheduled on-site visits are completed, will be allowed to take part in this study, if all other eligibility criteria are met.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Prevention
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Quadruple

Number of Arms

4

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: AZD6489 Dose A; Participants will receive AZD6489 Dose A as a single dose intramuscular injection on Day 1.	Biological: AZD6489; Participants will receive AZD6489 as a single intramuscular injection.
Experimental: AZD6489 Dose B; Participants will receive AZD6489 Dose B as a single dose intramuscular injection on Day 1.	Biological: AZD6489; Participants will receive AZD6489 as a single intramuscular injection.
Active Comparator: Licensed RSV vaccine #1; Participants will receive licensed RSV vaccine #1 as a single dose intramuscular injection on Day 1.	Biological: Licensed RSV vaccine #1; Participants will receive licensed RSV vaccine #1 as a single intramuscular injection.
Active Comparator: Licensed RSV vaccine #2; Participants will receive licensed RSV vaccine #2 as a single dose intramuscular injection on Day 1.	Biological: Licensed RSV vaccine #2; Participants will receive licensed RSV vaccine #2 as a single intramuscular injection.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Incidence of immediate unsolicited adverse events (AEs)	To assess the safety of a single IM vaccination with AZD6489 or licensed RSV vaccines	30 minutes post-study intervention
Incidence of injection site and systemic solicited adverse reactions (ARs)	To assess the safety of a single IM vaccination with AZD6489 or licensed RSV vaccines	Day 1 through 7 days post-study intervention
Incidence of unsolicited adverse events (AEs)	To assess the safety of a single IM vaccination with AZD6489 or licensed RSV vaccines	Day 1 through 28 days post-study intervention
Incidence of serious adverse events (SAEs)	To assess the safety of a single IM vaccination with AZD6489 or licensed RSV vaccines	Day 1 to Day 365
Incidence of adverse events of special interest (AESIs)	To assess the safety of a single IM vaccination with AZD6489 or licensed RSV vaccines	Day 1 to Day 365
Incidence of medically attended adverse events (MAAEs)	To assess the safety of a single IM vaccination with AZD6489 or licensed RSV vaccines	Day 1 to Day 365
RSV A nAb responses to AZD6489	To characterize the nAb responses to RSV A in serum following a single IM vaccination with AZD6489	Day 29

Collaborators and Investigators

• Sponsor: AstraZeneca

Study record dates

Study Major Dates

• Study Start (Actual): July 8, 2026
• Primary Completion (Estimated): October 15, 2026
• Study Completion (Estimated): September 6, 2027

Study Registration Dates

• First Submitted: July 7, 2026
• First Submitted That Met QC Criteria: July 16, 2026
• First Posted (Actual): July 21, 2026

Study Record Updates

• Last Update Posted (Actual): July 21, 2026
• Last Update Submitted That Met QC Criteria: July 16, 2026
• Last Verified: July 1, 2026

More Information

Terms related to this study

• Other Study ID Numbers: D7280C00001

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: YES

IPD Plan Description

Qualified researchers can request access to anonymized individual patient-level data from AstraZeneca group of companies sponsored clinical trials via the request portal Vivli.org. All requests will be evaluated as per the AZ disclosure commitment: https://astrazenecagrouptrials.pharmacm.com/ST/Submission/Disclosure.

Yes, indicates that AZ are accepting requests for IPD, but this does not mean all requests will be shared.

• IPD Sharing Time Frame: AstraZeneca will meet or exceed data availability as per the commitments made to the EFPIA PhRMA Data Sharing Principles. For details of our timelines, please refer to our disclosure commitment at https://astrazenecagrouptrials.pharmacm.com/ST/Submission/Disclosure.
• IPD Sharing Access Criteria: When a request has been approved AstraZeneca will provide access to the anonymized individual patient-level data via secure research environment Vivli.org. Signed Data Usage Agreement (non-negotiable contract for data accessors) must be in place before accessing requested information.
• IPD Sharing Supporting Information Type: STUDY_PROTOCOL; SAP

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No