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A Study to Evaluate the Safety and Immunogenicity of COVID-19 Vaccine and Influenza Combination Vaccine

A Randomized, Observer-Blinded, Active-Controlled Study to Evaluate the Safety and Immunogenicity of a COVID-19 Influenza Combination Nanoparticle Vaccine and a Standalone Trivalent Nanoparticle Influenza Hemagglutinin Vaccine in Participants ≥ 65 Years of Age.

Status
Active, not recruiting
Phases
Phase 3
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT06291857
Enrollment
9320
Registered
2024-03-04
Start date
2024-12-09
Completion date
2026-09-30
Last updated
2025-07-18

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

COVID-19

Keywords

CIC (Coronavirus Disease 2019 Influenza Combination), Influenza, Fluzone High-Dose

Brief summary

This is a medical study where participants will be randomly assigned to receive either a new combination vaccine that protects against both COVID-19 and the flu, or a standard flu vaccine. The researchers conducting the study won't know which vaccine each participant receives, ensuring their observations are unbiased. This study compares the new combination vaccine to an already available flu vaccine to see how well it works. It's a large-scale, final-stage study designed to thoroughly check how well the vaccines trigger an immune response (immunogenicity) and how safe they are.

Detailed description

The study will enroll up to approximately 7,022,000 medically stable (based on history and physical examination) adult male and female participants ≥ 65 65 years of age in Part 1 and up to approximately 2,300 medically stable (based on history and physical examination) adult male and female participants ≥ 65 years of age in Part 2. In Part 1, pParticipants will be randomly assigned to receive either CIC, Novavax COVID-19 Vaccine, tNIV, or Fluzone High-Dose in a 3:2:1:3 ratio, respectively. All participants will receive a single intramuscular (IM) injection on Day 0, will remain on study for immunogenicity data collection through Day 182 and safety data collection through Day 364 (End of Study \[EoS\]).

Interventions

BIOLOGICALCIC Vaccine Co-formulated tNIV2 , SARSCoV-2 rS and Matrix-M Adjuvant

CIC will contain SARs-CoV-2 antigen (35 μg), tNIV antigens (2 influenza A \[H1N1 and H3N2\] and 1 influenza B-Victoria lineage strains; 60 μg/strain

BIOLOGICALNovavax COVID-19 Vaccine

Each 0.5 mL dose comprises 5 µg SARS-CoV-2 S protein and 50 µg Matrix-M adjuvant

BIOLOGICALtNIV Vaccine

2 influenza A \[H1N1 and H3N2\] and 1 influenza B-Victoria lineage strains (60 μg/strain), and Matrix-M adjuvant (75 μg)

Fluzone High-Dose is supplied as a suspension for IM injection 0.5 mL with 60 µg per strain

Sponsors

Novavax
Lead SponsorINDUSTRY

Study design

Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
PREVENTION
Masking
SINGLE (Subject)

Eligibility

Sex/Gender
ALL
Age
65 Years to 75 Years
Healthy volunteers
Yes

Inclusion criteria

To be included in this study, each individual must satisfy all the following criteria: 1. Willing and able to give informed consent prior to study enrollment. 2. Medically stable adult male or female ≥ 65 years of age at Screening. 3. Participants may have 1 or more chronic medical diagnoses, but should be clinically stable as assessed by: 1. Absence of changes in medical therapy in the past 2 months due to treatment failure or toxicity; 2. Absence of medical events qualifying as SAEs within 3 months; and 3. Absence of known, current, and life-limiting diagnoses which render survival to completion of the protocol unlikely in the opinion of the Investigator. 4. The participant has a body mass index (BMI) of 17 to 40 kg/m2, inclusive, at Screening. 5. Participant must be able to receive an injection in the deltoid of at least 1 arm. 6. Able to attend study visits, comply with study requirements, and provide reliable and complete reports of AEs. 7. Participants must have completed a primary vaccination series/booster against SARS CoV-2 with an authorized/approved COVID-19 vaccine, with receipt of last dose of authorized/approved vaccine (with or without boosters\[s\]) ≥ 8 weeks prior to vaccination. 8. Female participants must be surgically sterile (ie, have undergone a hysterectomy, bilateral tubal ligation, or bilateral oophorectomy) or postmenopausal (defined as amenorrhea at least 12 consecutive months) 9. Participants must agree to not participate in any other SARS-CoV-2 or influenza prevention or treatment studies for the duration of the study. Note: For participants who become hospitalized with COVID-19 or influenza, participation in investigational treatment studies is permitted.

Exclusion criteria

If an individual meets any of the following criteria, he or she is ineligible for this study: 1. History of laboratory-confirmed (by polymerase chain reaction \[PCR\], rapid antigen test, or rapid molecular assay) COVID-19, asymptomatic SARS-CoV-2 infection, or influenza within ≤ 8 weeks prior to Screening. 2. Any ongoing, symptomatic acute illness requiring medical or surgical care or chronic illness that required substantive changes in medication in the past 2 months prior to Screening indicating that chronic illness/disease is not stable (at the discretion of the investigator). This includes any current workup of undiagnosed illness that could lead to a new condition. 3. Serious chronic diseases inclusive of: 1. Uncontrolled hypertension (NOTE: hypertension ≤ 170/100 is NOT exclusionary); 2. Congestive heart failure requiring hospitalization within 3 months prior to Screening 3. Chronic obstructive pulmonary disease (COPD) requiring hospitalization within 3 months prior to Screening (NOTE: stable COPD is NOT exclusionary); 4. Within 3 months prior to Screening, evidence of unstable coronary artery disease as manifested by cardiac interventions (eg, cardiac stent placement, coronary artery bypass graft surgery), new cardiac medications for control of symptoms, or unstable angina (NOTE: stable coronary heart disease is NOT exclusionary); 5. Hospitalization for diabetic ketoacidosis within 6 months prior to Screening 6. Chronic kidney disease/renal requiring institution of substantive new therapy within 3 months prior to Screening 7. Chronic clinically significant gastrointestinal and hepatic diseases requiring hospitalization or institution of substantive new therapy within 3 months prior to Screening. (for example, gastroesophageal reflux disease is NOT exclusionary) 8. Chronic neurological diseases or neurological compromise preventing access to the study clinic, compliance with protocol, or accurate reporting of safety. 4. Participation in research involving an investigational product (drug/biologic/device) within 90 days before planned date of vaccination. 5. Use of COVID-19 prophylactic or treatment monoclonal antibodies or antibody cocktails within 90 days prior to planned date of vaccination. 6. History of a serious reaction to a prior influenza vaccination or known allergy to constituents of influenza vaccines - including egg proteins - or polysorbate 80; or any known allergies to products contained in the investigational product. 7. Any history of anaphylaxis to any prior vaccine. 8. History of Guillain-Barré Syndrome following a previous influenza vaccine. 9. Receipt of any vaccine in the 4 weeks preceding the study vaccination and any influenza vaccine within 2 months preceding the study vaccination. Note: Routine vaccinations will not be allowed until after study Day 21 and COVID-19 and influenza vaccination will not be allowed until after Day 84. 10. Any known or suspected autoimmune or immunosuppressive illness, congenital or acquired, based on medical history and/or physical examination (NOTE: well-controlled hypothyroidism and mild psoriasis are not exclusionary). 11. Chronic administration (defined as more than 14 continuous days) of immunosuppressants or other immune-modifying drugs within 6 months prior to the administration of the study vaccines. An immunosuppressant dose of glucocorticoid is defined as a systemic dose ≥ 10 mg of prednisone per day or equivalent. The use of topical, inhaled, and nasal glucocorticoids is permitted. 12. Administration of immunoglobulins and/or any blood products within the 3 months preceding the administration of the study vaccine or during the study. 13. Active cancer (malignancy) therapy within 1 year prior to study vaccination (with the exception of adequately treated non-melanomatous skin carcinoma or lentigo maligna and uterine cervical carcinoma in situ without evidence of disease, at the discretion of the investigator). 14. Participants who are breastfeeding, pregnant, or who plan to become pregnant prior to the EoS. 15. Suspected or known history of alcohol abuse or drug addiction within 2 years prior to study vaccination, which in the opinion of the investigator, might interfere with protocol compliance. 16. Acute disease at the time of enrollment (defined as the presence of a moderate or severe illness with or without fever, or an oral temperature ≥ 38.0°C, on the planned day of vaccine administration). 17. History of myocarditis or pericarditis. 18. Any condition that in the opinion of the investigator would pose a health risk to the participant if enrolled or could interfere with evaluation of the vaccine or interpretation of study results (including neurologic or psychiatric conditions deemed likely to impair the quality of safety reporting). 19. Study team member or immediate family member of any study team member (inclusive of Sponsor, Contract Research Organization, and study site personnel involved in the conduct or planning of the study). 20. Known history of any prior motor neuropathy.

Design outcomes

Primary

MeasureTime frameDescription
Numbers of participants with solicited local and systemic adverse events (AEs)7 days post-vaccinationNumbers of participants with solicited local and systemic AEs over the 7 days post-vaccination.
Numbers of participants reporting unsolicited AEs and medically attended adverse events (MAAEs).28 days post-vaccinationNumbers of participants reporting unsolicited AEs and MAAEs over 21 days post-vaccination.
Treatment-related MAAEs, serious adverse events (SAEs), and adverse events of special interest (AESIs) (including potential immune-mediated medical conditions [PIMMCs] and myocarditis and/or pericarditis)Day 0 to Day 364Numbers of participants with treatment-related MAAEs, AESIs (including PIMMC and myocarditis and/or pericarditis), and SAEs will be collected for 12 months (approximately 364 days) post-vaccination.
Hemagglutination Inhibition (HAI) antibody responses of the CIC vaccine compared to Fluzone High-Dose of homologous A and B strains Expressed as GMTDays 0 and 28Hemagglutination Inhibition (HAI) antibody responses of the CIC vaccine compared to Fluzone High-Dose of homologous influenza strains (two influenza A strains and one influenza B-Victoria lineage strain) on Days 0 and 28
Hemagglutination Inhibition (HAI) antibody responses of the CIC vaccine compared to Fluzone High-Dose of homologous A and B strains Expressed as GMTRDays 28Hemagglutination Inhibition (HAI) antibody responses of the CIC vaccine compared to Fluzone High-Dose of homologous influenza strains (two influenza A strains and one influenza B-Victoria lineage strain) on Days 28
Percentage of Participants With a (HAI) antibody responses of the CIC vaccine compared to Fluzone High-Dose for 3 vaccine-homologous influenza strains Expressed as SCRDays 28Percentage of Participants With a (HAI) antibody responses of the CIC vaccine compared to Fluzone High-Dose for 3 vaccine-homologous influenza strain on Days 28
Neutralizing Antibody (NAb) Responses of the CIC vaccine compared to Fluzone High-Dose of homologous A and B strains Expressed as GMTDays 28Neutralizing Antibody (NAb) Responses Assessed against three homologous influenza strains (two influenza A strains and one influenza B-Victoria lineage strain) on Day 28
Neutralizing Antibody (NAb) Responses of the CIC vaccine compared to Fluzone High-Dose of homologous A and B strains Expressed as GMTRDays 28Neutralizing Antibody (NAb) Responses Assessed against three homologous influenza strains (two influenza A strains and one influenza B-Victoria lineage strain) on Day 28
Percentage of Participants With a (NAb) Responses of the CIC vaccine compared to Fluzone High-Dose of homologous A and B strains Expressed as SCRDays 28Neutralizing Antibody (NAb) Responses Assessed against three homologous influenza strains (two influenza A strains and one influenza B-Victoria lineage strain) on Day 28
Hemagglutination Inhibition (HAI) antibody titers specific to HA receptor-binding domains of (tNIV) comparable to Fluzone High-Dose of homologous influenza A and B strains expressed as GMTDay 28Hemagglutination Inhibition (HAI) antibody titers specific to HA receptor-binding domains of (tNIV) comparable to Fluzone High-Dose of 2 influenza A strains and an influenza B-Victoria lineage strain) on Day 28
Hemagglutination Inhibition (HAI) antibody titers specific to HA receptor-binding domains of (tNIV) comparable to Fluzone High-Dose of homologous influenza A and B strains expressed as GMTRDay 28Hemagglutination Inhibition (HAI) antibody titers specific to HA receptor-binding domains of (tNIV) comparable to Fluzone High-Dose of 2 influenza A strains and an influenza B-Victoria lineage strain) on Day 28
Percentage of Participants with (HAI) antibody titers specific to HA receptor-binding domains of (tNIV) comparable to Fluzone High-Dose of homologous influenza A and B strains expressed as SCRDay 28Hemagglutination Inhibition (HAI) antibody titers specific to HA receptor-binding domains of (tNIV) comparable to Fluzone High-Dose of 2 influenza A strains and an influenza B-Victoria lineage strain) on Day 28

Secondary

MeasureTime frameDescription
Influenza neutralizing antibody (NAb) responses of trivalent nanoparticle influenza vaccine (tNIV) comparable to Fluzone High-Dose Expressed as GMFRDay 28Influenza neutralizing antibody (NAb) responses of trivalent nanoparticle influenza vaccine (tNIV) comparable to Fluzone High-Dose against three influenza strains (two A strains and one B-Victoria strain) on Day 28.
Immunogenicity- HAI antibody titers specific for the HA receptor binding domains of vaccine homologous A and B influenza strains Expressed as Geometric Mean Titers (GMT)Days 28HAI antibody titers specific for the HA receptor binding domains of vaccine response CIC vaccine compared to Fluzone High-Dose on Day 28
Percentage of Participants with (NAb) responses of trivalent nanoparticle influenza vaccine (tNIV) comparable to Fluzone High-Dose Expressed as SCRDay 28Influenza neutralizing antibody (NAb) responses of trivalent nanoparticle influenza vaccine (tNIV) comparable to Fluzone High-Dose against three influenza strains (two A strains and one B-Victoria strain) on Day 28.
Influenza neutralizing antibody (NAb) responses of trivalent nanoparticle influenza vaccine (tNIV) comparable to Fluzone High-Dose Expressed as GMTRDay 28Influenza neutralizing antibody (NAb) responses of trivalent nanoparticle influenza vaccine (tNIV) comparable to Fluzone High-Dose against three influenza strains (two A strains and one B-Victoria strain) on Day 28.
Immunogenicity- HAI antibody titers specific for the HA receptor binding domains of vaccine homologous A and B influenza strains Expressed as GMFRDays 28HAI antibody titers specific for the HA receptor binding domains of vaccine response CIC vaccine compared to Fluzone High-Dose on Day 28
Percentage of Participants with HAI antibody titers specific for the HA receptor binding domains of vaccine homologous A and B influenza strains Expressed as SCRDays 28HAI antibody titers specific for the HA receptor binding domains of vaccine response CIC vaccine compared to Fluzone High-Dose on Day 28
HAI antibody titers specific for the HA receptor binding domains of vaccine homologous A and B influenza strains Expressed as GMTRDays 28HAI antibody titers specific for the HA receptor binding domains of vaccine response CIC vaccine compared to Fluzone High-Dose on Day 28
Influenza NAb responses: neutralizing antibody titers specific to vaccine homologous wild-type A and B influenza strains, is expressed as GMTDays 28Neutralizing antibody titers specific to vaccine homologous influenza strains (ie, 2 influenza A strains and an influenza B-Victoria lineage strain) as measured by a neutralization assay, CIC and Fluzone High Dose on Day 28
Influenza NAb responses: neutralizing antibody titers specific to vaccine homologous wild-type A and B influenza strains, is expressed as GMFRDays 28Neutralizing antibody titers specific to vaccine homologous influenza strains (ie, 2 influenza A strains and an influenza B-Victoria lineage strain) as measured by a neutralization assay, CIC and Fluzone High Dose on Day 28
Percentage of Participants with a NAb responses: neutralizing antibody titers specific to vaccine homologous wild-type A and B influenza strains, is expressed as SCRDays 28Neutralizing antibody titers specific to vaccine homologous influenza strains (ie, 2 influenza A strains and an influenza B-Victoria lineage strain) as measured by a neutralization assay, CIC and Fluzone High Dose on Day 28
Influenza NAb responses: neutralizing antibody titers specific to vaccine homologous wild-type A and B influenza strains, is expressed as GMTRDays 28Neutralizing antibody titers specific to vaccine homologous influenza strains (ie, 2 influenza A strains and an influenza B-Victoria lineage strain) as measured by a neutralization assay, CIC and Fluzone High Dose on Day 28
Hemagglutination Inhibition (HAI) antibody titers to tNIV and Fluzone High-Dose Expressed as GMTDay 28Hemagglutination Inhibition (HAI) antibody titers specific to HA receptor-binding domains of vaccine-homologous influenza A and B strains on Day 28
Hemagglutination Inhibition (HAI) antibody titers to tNIV and Fluzone High-Dose Expressed as GMFRDay 28Hemagglutination Inhibition (HAI) antibody titers specific to HA receptor-binding domains of vaccine-homologous influenza A and B strains on Day 28 homologous SARS-CoV-2 strain CIC, Fluarix or Fluzone HD, and Novavax COVID-19 Vaccine expressed as SCR
Percentage of Participants with (HAI) antibody titers to tNIV and Fluzone High-Dose Expressed as SCRDay 28Hemagglutination Inhibition (HAI) antibody titers specific to HA receptor-binding domains of vaccine-homologous influenza A and B strains on Day 28
Influenza neutralizing antibody (NAb) responses of trivalent nanoparticle influenza vaccine (tNIV) comparable to Fluzone High-Dose Expressed as GMTDay 28Influenza neutralizing antibody (NAb) responses of trivalent nanoparticle influenza vaccine (tNIV) comparable to Fluzone High-Dose against three influenza strains (two A strains and one B-Victoria strain) on Day 28.

Countries

Australia, New Zealand

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026