Skip to main content
OpenTrials
Completed

NCT Number: NCT06237049

A Study to Learn About a Combined COVID-19 and Influenza Shot in Healthy Adults

The purpose of this clinical trial is to see if combining a licensed COVID-19 vaccine and a licensed influenza vaccine into a single shot is safe and can help produce antibodies to defend the body against both SARS-CoV-2 (the virus that causes COVID-19) and influenza. Participants enrolled in this trial will be healthy adults, 50 years of age or older.

Completed

Looking for future studies?

Notify Me

Key information

Conditions

Influenza, Human COVID-19 Coronaviridae Infections Coronavirus Infections Infections Lung Diseases Nidovirales Infections Orthomyxoviridae Infections Pneumonia Pneumonia, Viral RNA Virus Infections Respiratory Tract Diseases Respiratory Tract Infections Sars-CoV-2 Infection Virus Diseases

Age range

50 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 2

Primary location

Orange County Research Center, Lake Forest, California, United States

Loading trial locations.

About this study

This is a Phase 1/2 study to evaluate the safety, tolerability, and immunogenicity of licensed BNT162b2 (Omi XBB.1.5) and recombinant influenza vaccine (RIV) administered together as a single injection (referred to as BNT162b2 [Omi XBB.1.5]/RIV) in healthy adults 50 years of age or older.

The safety, tolerability, and immunogenicity of BNT162b2 (OmiXBB1.5)/RIV administered as a single injection will be compared to BNT162b2 (Omi XBB.1.5) and RIV administered simultaneously as 2 separate injections (coadministered), and to BNT162b2 (Omi XBB.1.5) or RIV when administered alone.

Across Phases 1 and 2, approximately 640 participants in total will be randomized with an equal randomization ratio to 1 of 4 vaccine groups and stratified by age.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Male or female participants aged 50 years or older at Visit 1 (Day 1).
  • Participants who are willing and able to comply with all scheduled visits, the investigational plan, laboratory tests, lifestyle considerations, and other study procedures.
  • Healthy participants who are determined by medical history, physical examination (if required), and clinical judgment of the investigator to be eligible for inclusion in the study.
  • Capable of giving signed informed consent as described in the protocol, which includes compliance with the requirements and restrictions listed in the informed consent document (ICD) and in the protocol.

Exclusion criteria

  • Any medical or psychiatric condition including recent (within the past year) or active suicidal ideation/behavior or laboratory abnormality that may increase the risk of study participation or, in the investigator's judgment, make the participant inappropriate for the study.
  • Known infection with human immunodeficiency virus (HIV), hepatitis C virus (HCV), or hepatitis B virus (HBV).
  • History of severe adverse reaction associated with any vaccine and/or severe allergic reaction (eg, anaphylaxis) to any component of the study interventions.
  • Participants with a history of autoimmune disease or an active autoimmune disease requiring therapeutic intervention, including but not limited to systemic or cutaneous lupus erythematosus, autoimmune arthritis/rheumatoid arthritis, multiple sclerosis, Sjögren's syndrome, idiopathic thrombocytopenia purpura, glomerulonephritis, autoimmune thyroiditis, temporal arteritis, psoriasis, and/or insulin-dependent diabetes mellitus.
  • Immunocompromised individuals with known or suspected immunodeficiency, determined by history and/or laboratory/physical examination.
  • Current heart disease, uncontrolled hypertension, or a prior history of myocarditis or pericarditis.
  • Bleeding diathesis or condition associated with prolonged bleeding that would, in the opinion of the investigator, contraindicate intramuscular injection.
  • Women who are pregnant, plan to become pregnant during the study, or are breastfeeding.
  • Prior history of ischemic stroke or transient ischemic attack.
  • Prior history of Guillain-Barré syndrome (GBS).
  • Participants with a calculated BMI of ≥35.
  • Receipt of chronic medications with known systemic immunosuppressant effects (including cytotoxic agents or systemic corticosteroids), or radiotherapy, within 60 days before enrollment through conclusion of the study.
  • Receipt of blood/plasma products, immunoglobulin, or monoclonal antibodies used for the treatment or prevention of COVID 19 or those that are considered immunosuppressive, from 90 days before study intervention administration, or planned receipt throughout the study.
  • Vaccination with any investigational or licensed influenza vaccine within 6 months (180 days) before study intervention administration, or ongoing receipt of chronic antiviral therapy with activity against influenza.
  • Vaccination with any investigational or licensed COVID-19 vaccine within 6 months (180 days) before study intervention administration.
  • Participation in other studies involving administration of an investigational product within 28 days prior to, and/or during, participation in this study.
  • Investigator site staff directly involved in the conduct of the study and their family members, site staff otherwise supervised by the investigator, and sponsor and sponsor delegate employees directly involved in the conduct of the study and their family members.
  • Deprived of freedom by an administrative or court order, or in an emergency setting, or hospitalized involuntarily.
  • Current alcohol abuse or drug addiction that in the opinion of the investigator might interfere with the study conduct or completion.

Treatment and study plan

BNT162b2 (Omi XBB.1.5)/RIV

Biological

Combination of BNT162b2 (Omi XBB.1.5) and RIV

BNT162b2 (Omi XBB.1.5)

Biological

Licensed COVID-19 vaccine

RIV

Biological

Licensed recombinant influenza vaccine

Normal Saline Placebo

Other

Normal saline (solution for injection)

Primary outcomes

  1. Percentage of Participants Who Reported Any Local Reaction up to 7 Days Following Vaccination

    Time frame: Day 1 to Day 7 following Vaccination on Day 1

    Local reactions included redness, swelling and pain at injection site, recorded by participants in an electronic diary (e-diary). Severity of all local reactions were evaluated as mild, moderate, severe or potentially life-threatening. In this outcome measure local reactions with any severity were reported for each left arm's deltoid and right arm's deltoid of each vaccine Group 1, 2, 3 and 4.

  2. Percentage of Participants Who Reported Any Systemic Events up to 7 Days Following Vaccination

    Time frame: Day 1 to Day 7 following Vaccination on Day 1

    Systemic events: fever, fatigue, headache, vomiting, diarrhea, chills, new/worsened muscle pain, new/worsened joint pain were recorded by participants in e-diary. Severity of all systemic events were evaluated as mild, moderate, severe or potentially life-threatening. In this outcome measure systemic events with any severity were reported.

  3. Percentage of Participants Who Reported Any Adverse Events (AEs) From Vaccination Through 4 Weeks After Vaccination

    Time frame: From Vaccination on Day 1 through 4 weeks after Vaccination

    An AE was defined as any untoward medical occurrence in a participant temporally associated with the use of study intervention, whether or not considered related to the study intervention. Events collected by systematic assessment (local reactions and systemic events) were excluded from evaluation.

  4. Percentage of Participants Who Reported Any Serious Adverse Events (SAEs) From Vaccination Through 6 Months After Vaccination

    Time frame: From Vaccination on Day 1 through 6 months after Vaccination

    An AE was defined as any untoward medical occurrence in a clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. An SAE was defined as any untoward medical occurrence that, at any dose, met one or more of the following criteria - resulted in death, was life-threatening, required inpatient hospitalization or prolongation of existing hospitalization, resulted in persistent or significant disability/incapacity, was a congenital anomaly/birth defect and other important medical events per protocol of the study. Events collected by systematic assessment (local reactions and systemic events) were excluded from evaluation.

  5. Geometric Mean Titers (GMTs) of Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) Omicron (XBB.1.5)-Neutralizing Titers Before Vaccination

    Time frame: Before Vaccination on Day 1

    GMTs and the corresponding 2-sided CIs were calculated by exponentiating the mean logarithm of the titers and the corresponding CIs (based on the Student t distribution). As planned, outcome measure evaluated GMTs of SARS-CoV-2 Omicron (XBB.1.5), hence results are reported only for those reporting groups where BNT162b2 (Omi XBB.1.5) was administered. Data was not collected and not reported for reporting group "Group 4: RIV + Placebo", where BNT162b2 (Omi XBB.1.5) was not administered.

  6. GMTs of SARS-CoV-2 Omicron (XBB.1.5)-Neutralizing Titers at 4 Weeks After Vaccination

    Time frame: At 4 weeks after Vaccination on Day 1

    GMTs and the corresponding 2-sided CIs were calculated by exponentiating the mean logarithm of the titers and the corresponding CIs (based on the Student t distribution). As planned, outcome measure evaluated GMTs of SARS-CoV-2 Omicron (XBB.1.5), hence results are reported only for those reporting groups where BNT162b2 (Omi XBB.1.5) was administered. Data was not collected and not reported for reporting group "Group 4: RIV + Placebo", where BNT162b2 (Omi XBB.1.5) was not administered.

  7. Geometric Mean Fold Rise (GMFR) of SARS-CoV-2 Omicron (XBB.1.5)-Neutralizing Titers From Before Vaccination to 4 Weeks After Vaccination

    Time frame: From before Vaccination on Day 1 to 4 weeks after Vaccination

    GMFR was the ratio of the geometric mean titre values 4 weeks after vaccination to before vaccination. GMFRs and the corresponding 2-sided CIs were calculated by exponentiating the mean logarithm of fold rises and the corresponding CIs (based on the Student t distribution). As planned, outcome measure evaluated GMTs of SARS-CoV-2 Omicron (XBB.1.5), hence results are reported only for those reporting groups where BNT162b2 (Omi XBB.1.5) was administered. Data was not collected and not reported for reporting group "Group 4: RIV + Placebo", where BNT162b2 (Omi XBB.1.5) was not administered.

  8. Percentages of Participants With Seroresponse to SARS-CoV-2 Omicron (XBB.1.5) at 4 Weeks After Vaccination

    Time frame: At 4 weeks after Vaccination on Day 1

    Seroresponse was defined as achieving a >=4-fold rise from baseline (before the study vaccination). If the baseline measurement was below the lower limit of quantification (LLOQ), the postvaccination measure of >=4*LLOQ is considered a seroresponse. Exact 2-sided CI, based on the Clopper and Pearson method. As planned, outcome measure evaluated GMTs of SARS-CoV-2 Omicron (XBB.1.5), hence results are reported only for those reporting groups where BNT162b2 (Omi XBB.1.5) was administered. Data was not collected and not reported for reporting group "Group 4: RIV + Placebo", where BNT162b2 (Omi XBB.1.5) was not administered.

  9. GMTs of Strain Specific Hemagglutinin Inhibition Assay (HAI) Titers Before Vaccination

    Time frame: Before Vaccination on Day 1

    GMTs and the corresponding 2-sided CIs were calculated by exponentiating the mean logarithm of the titers and the corresponding CIs (based on the Student t distribution). The 4 virus strains which were evaluated and reported in this outcome measure were A/Victoria/4897/2022 (H1N1) HAI, A/Darwin/9/2021 (H3N2) HAI, B/Michigan/1/2021 HAI and B/Phuket/3073/2013 HAI. As planned, outcome measure evaluated GMTs of strain specific HAI, hence results are reported only for those reporting groups where RIV was administered. Data was not collected and not reported for reporting group "Group 3: BNT162b2 (Omi XBB.1.5) + Placebo", where RIV was not administered.

  10. GMTs of Strain Specific Hemagglutinin Inhibition Assay (HAI) Titers at 4 Weeks After Vaccination

    Time frame: At 4 weeks after Vaccination on Day 1

    GMTs and the corresponding 2-sided CIs were calculated by exponentiating the mean logarithm of the titers and the corresponding CIs (based on the Student t distribution). The 4 virus strains which were evaluated and reported in this outcome measure were A/Victoria/4897/2022 (H1N1) HAI, A/Darwin/9/2021 (H3N2) HAI, B/Michigan/1/2021 HAI and B/Phuket/3073/2013 HAI. As planned, outcome measure evaluated GMTs of strain specific HAI, hence results are reported only for those reporting groups where RIV was administered. Data was not collected and not reported for reporting group "Group 3: BNT162b2 (Omi XBB.1.5) + Placebo", where RIV was not administered.

  11. GMFR of Strain Specific HAI Titers From Before Vaccination to 4 Weeks After Vaccination

    Time frame: From before Vaccination to 4 weeks after Vaccination on Day 1

    GMFR was the ratio of the geometric mean titre values 4 weeks after vaccination to before vaccination. GMFRs and the corresponding 2-sided CIs were calculated by exponentiating the mean logarithm of fold rises and the corresponding CIs (based on the Student t distribution). The 4 virus strains which were evaluated and reported in this outcome measure were A/Victoria/4897/2022 (H1N1) HAI, A/Darwin/9/2021 (H3N2) HAI, B/Michigan/1/2021 HAI and B/Phuket/3073/2013 HAI. As planned, outcome measure evaluated GMFRs of strain specific HAI, hence results are reported only for those reporting groups where RIV was administered. Data was not collected and not reported for reporting group "Group 3: BNT162b2 (Omi XBB.1.5) + Placebo", where RIV was not administered.

  12. Percentages of Participants Achieving HAI Seroconversion at 4 Weeks After Vaccination

    Time frame: At 4 weeks after Vaccination on Day 1

    Seroconversion was defined as an HAI titer <1:10 prior to vaccination and >=1:40 at the time point of interest, or an HAI titer of >=1:10 prior to vaccination with a minimum 4-fold rise at the time point of interest. Exact 2-sided CI, based on the Clopper and Pearson method. The 4 virus strains which were evaluated and reported in this outcome measure were A/Victoria/4897/2022 (H1N1) HAI, A/Darwin/9/2021 (H3N2) HAI, B/Michigan/1/2021 HAI and B/Phuket/3073/2013 HAI. As planned, outcome measure evaluated seroconversion of strain specific HAI, hence results are reported only for those reporting groups where RIV was administered. Data was not collected and not reported for reporting group "Group 3: BNT162b2 (Omi XBB.1.5) + Placebo", where RIV was not administered.

  13. Percentages of Participants With HAI Titers >= 1:40 Before Vaccination

    Time frame: Before Vaccination on Day 1

    Percentages of participants with HAI titers >= 1:40 before vaccination along with the associated 2-sided 95% CIs, was provided for each vaccine group in this outcome measure. Exact 2-sided CI, based on the Clopper and Pearson method. The 4 virus strains which were evaluated and reported in this outcome measure were A/Victoria/4897/2022 (H1N1) HAI, A/Darwin/9/2021 (H3N2) HAI, B/Michigan/1/2021 HAI and B/Phuket/3073/2013 HAI. As planned, outcome measure evaluated of strain specific HAI, hence results are reported only for those reporting groups where RIV was administered. Data was not collected and not reported for reporting group "Group 3: BNT162b2 (Omi XBB.1.5) + Placebo", where RIV was not administered.

  14. Percentages of Participants With HAI Titers >= 1:40 at 4 Weeks After Vaccination

    Time frame: At 4 Weeks after Vaccination on Day 1

    Percentages of participants with HAI titers >= 1:40 at 4 weeks after vaccination along with the associated 2-sided 95% CIs, was provided for each vaccine group in this outcome measure. Exact 2-sided CI, based on the Clopper and Pearson method. The 4 virus strains which were evaluated and reported in this outcome measure were A/Victoria/4897/2022 (H1N1) HAI, A/Darwin/9/2021 (H3N2) HAI, B/Michigan/1/2021 HAI and B/Phuket/3073/2013 HAI. As outcome measure evaluated of strain specific HAI, hence results are reported only for those reporting groups where RIV was administered. Data was not collected and not reported for reporting group "Group 3: BNT162b2 (Omi XBB.1.5) + Placebo", where RIV was not administered.

Sponsors and collaborators

Lead sponsor

Pfizer

Industry

Registry information

Official study title

A Phase 1/2 Randomized Study to Evaluate the Safety, Tolerability, and Immunogenicity of a Modified RNA COVID-19 Vaccine and a Recombinant Influenza Vaccine Administered as a Single Injection in Healthy Adults 50 Years of Age or Older

Important dates

Study start
2024
Primary completion
2024
Study completion
2024
First posted
Feb 1, 2024
Registry last updated
Sep 30, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

Related clinical trials

Published trials that share one or more normalized conditions with this study.