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ClinicalTrials.gov record
Completed Phase 3 Interventional Accepts healthy volunteers Results available

A Study to Evaluate a Modified RNA Vaccine Against Influenza in Adults 18 Years of Age or Older

ClinicalTrials.gov ID: NCT05540522

Public ClinicalTrials.gov record NCT05540522. Field values are reproduced from the official study page; the official ClinicalTrials.gov record remains the source of truth for eligibility, enrollment, and contact information.

ClinicalTrials.gov public records Last synced Oct 22, 2026, 8:22 AM EDT

Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.

Official title

A PHASE 3, RANDOMIZED, OBSERVER-BLINDED STUDY TO EVALUATE THE EFFICACY, SAFETY, TOLERABILITY, AND IMMUNOGENICITY OF A MODIFIED RNA VACCINE AGAINST INFLUENZA COMPARED TO LICENSED INACTIVATED INFLUENZA VACCINE IN HEALTHY ADULTS 18 YEARS OF AGE OR OLDER

Brief summary

Reproduced verbatim from the official ClinicalTrials.gov record. Not medical advice.

This is a Phase 3, randomized, observer-blinded study to evaluate the efficacy, safety, tolerability, and immunogenicity of a single dose of a quadrivalent influenza modRNA vaccine compared to licensed inactivated influenza vaccine in healthy adults 18 years of age and older.

Study identification

NCT ID
NCT05540522
Recruitment status
Completed
Study type
Interventional
Phase
Phase 3
Lead sponsor
Pfizer
Industry
Enrollment
45,789 participants

Conditions and interventions

Eligibility (public fields only)

Age range
18 Years and older
Sex
All
Healthy volunteers
Accepts healthy volunteers

This page does not interpret eligibility. Detailed inclusion and exclusion criteria are on the official ClinicalTrials.gov record.

Study timeline

Start date
Sep 12, 2022 (Actual)
Primary completion
Mar 12, 2024 (Actual)
Completion
Mar 12, 2024 (Actual)
Last update posted
May 8, 2025

2022 – 2024

United States locations

U.S. sites
263
U.S. states
42
U.S. cities
195
Facility City State ZIP Site status
North Alabama Research Center Athens Alabama 35611 —
St. Vincent's Birmingham Hospital Birmingham Alabama 35205 —
Accel Research Sites Network - Birmingham Clinical Research Unit Birmingham Alabama 35216 —
Ross Bridge Medical Practice, LLC-CCT Research Birmingham Alabama 35226 —
SEC Clinical Research Dothan Alabama 36305 —
Lakeview Clinical Research Guntersville Alabama 35976 —
Medical Affiliated Research Center Huntsville Alabama 35801 —
Lenzmeier Family Medicine/CCT Research Glendale Arizona 85308 —
Aventiv Research Mesa Arizona 85206 —
Desert Clinical Research/ CCT Research Mesa Arizona 85213 —
HOPE Research Institute Phoenix Arizona 85018 —
The Pain Center of Arizona Phoenix Arizona 85018 —
HOPE Research Institute - Phoenix Phoenix Arizona 85023 —
HOPE Research Institute Phoenix Arizona 85023 —
Foothills Research Center/ CCT Research Phoenix Arizona 85044 —
Epic Medical Research - Surprise Surprise Arizona 85378 —
Fiel Family and Sports Medicine, PC/CCT Research Tempe Arizona 85283 —
HOPE Research Institute Tempe Arizona 85284 —
Noble Clinical Research Tucson Arizona 85704 —
Baptist Health Center For Clinical Research Little Rock Arkansas 72205 —
Applied Research Center of Arkansas Little Rock Arkansas 72212 —
Anaheim Clinical Trials Anaheim California 92801 —
Velocity Clinical Research, San Bernardino Banning California 92220 —
Benchmark Research Colton California 92324 —
Ascada Health PC dba Ascada Research Fullerton California 92835 —
Marvel Clinical Research Huntington Beach California 92647 —
Velocity Clinical Research, Huntington Park Huntington Park California 90255 —
Velocity Clinical Research, San Diego La Mesa California 91942 —
Orange County Research Center Lake Forest California 92630 —
Ark Clinical Research Long Beach California 90815 —
Kaiser Permanente Los Angeles California 90027 —
Velocity Clinical Research, Westlake Los Angeles California 90057 —
Velocity Clinical Research, North Hollywood North Hollywood California 91606 —
Center for Clinical Trials, LLC Paramount California 90723 —
Empire Clinical Research Pomona California 91767 —
Paradigm Clinical Research Centers, Inc Redding California 96001 —
Peninsula Research Associates Rolling Hills Estates California 90274 —
Benchmark Research Sacramento California 95864 —
Artemis Institute for Clinical Research San Diego California 92103 —
Wr-McCr, Llc San Diego California 92120 —
California Research Foundation San Diego California 92123 —
Encompass Clinical Research Spring Valley California 91978 —
Med Partners, Inc. dba Premiere Medical Center of Burbank, Inc. Toluca Lake California 91602 —
Collaborative Neuroscience Research, LLC Torrance California 90504 —
Ark Clinical Research - Tustin Tustin California 92780 —
Diablo Clinical Research, Inc. Walnut Creek California 94598 —
Lynn Institute of Denver Aurora Colorado 80012 —
Tekton Research, LLC. Fort Collins Colorado 80525 —
Tekton Research, LLC. Longmont Colorado 80501 —
Paradigm Clinical Research Centers, Inc Wheat Ridge Colorado 80033 —
New England Research Associates, LLC Bridgeport Connecticut 06606 —
Clinical Research Consulting Milford Connecticut 06460 —
New Haven Clinical Research Unit New Haven Connecticut 06511 —
Yale Cardiology New Haven Connecticut 06519 —
Yale University School of Medicine New Haven Connecticut 06519 —
Stamford Therapeutics Consortium Stamford Connecticut 06905 —
Washington Health Institute Washington D.C. District of Columbia 20017 —
JEM Research Institute Atlantis Florida 33462 —
Tampa Bay Medical Research Clearwater Florida 33761 —
Alliance for Multispecialty Research, LLC Coral Gables Florida 33134 —
Universal Axon Clinical Research, LLC Doral Florida 33166 —
Fleming Island Center for Clinical Research Fleming Island Florida 32003 —
Proactive Clinical Research,LLC Fort Lauderdale Florida 33308 —
Alliance for Multispecialty Research, LLC Fort Myers Florida 33912 —
Robert B. Pritt, DO Fort Myers Florida 33912 —
Best Quality Research,Inc. Hialeah Florida 33016 —
Jacksonville Center for Clinical Research Jacksonville Florida 32216 —
Clinical Neuroscience Solutions, Inc. dba CNS Healthcare Jacksonville Florida 32256 —
Health Awareness Jupiter Florida 33458 —
Wr-Msra.Llc Lake City Florida 32055 —
JEM Research Institute Lake Worth Florida 33462 —
Accel Research Sites Network - Lakeland Clinical Research Unit Lakeland Florida 33803 —
Accel Research Sites - St. Petersburg Clinical Research Unit Largo Florida 33777 —
Accel Research Sites Network - Maitland Clinical Research Unit Maitland Florida 32751 —
Care Research - West Flagler Street Miami Florida 33130 —
Gerardo Polanco, MD Miami Florida 33156 —
Entrust Clinical Research Miami Florida 33176 —
Miami Dade Medical Research Institute, LLC Miami Florida 33176 —
Palm Springs Community Health Center Miami Lakes Florida 33014 —
Clinical Neuroscience Solutions, Inc. Orlando Florida 32801 —
Headlands Research Orlando Orlando Florida 32819 —
Innovation Medical Research Center Palmetto Bay Florida 33157 —
DBC Research USA Pembroke Pines Florida 33029 —
United Medical Research Port Orange Florida 32127 —
Genesis Clinical Research, LLC Tampa Florida 33603 —
Angels Clinical Research Institute Tampa Florida 33614 —
Clinical Site Partners, LLC dba Flourish Research Winter Park Florida 32789 —
Centricity Research Columbus Georgia Multispecialty Columbus Georgia 31904 —
IACT Health Rincon Georgia 31326 —
Centricity Research Rincon Pulmonology Rincon Georgia 31406 —
AGILE Clinical Research Trials, LLC Sandy Springs Georgia 30328 —
WR-Mount Vernon Clinical Research, LLC Sandy Springs Georgia 30328 —
CenExel iResearch, LLC Savannah Georgia 31405 —
Javara - Privia Medical Group Georgia - Savannah Savannah Georgia 31406 —
Velocity Clinical Research, Savannah Savannah Georgia 31406 —
Clinical Research Atlanta Stockbridge Georgia 30281 —
Rophe Adult and Pediatric Medicine/SKYCRNG Union City Georgia 30291 —
East-West Medical Research Institute Honolulu Hawaii 96814 —
Clinical Research Prime Idaho Falls Idaho 83404 —
Solaris Clinical Research Meridian Idaho 83646 —
Koch Family Medicine Morton Illinois 61550 —
Accellacare - DuPage Oak Lawn Illinois 60453 —
MediSphere Medical Research Center - Evansville - West Franklin Street Evansville Indiana 47712 —
MediSphere Medical Research Center - EAST Evansville Indiana 47714 —
Velocity Clinical Research, Valparaiso Valparaiso Indiana 46383 —
University of Iowa Iowa City Iowa 52242 —
Velocity Clinical Research, Sioux City Sioux City Iowa 51106 —
Alliance for Multispecialty Research, LLC Newton Kansas 67114 —
Alliance for Multispecialty Research, LLC Wichita Kansas 67205 —
Alliance for Multispecialty Research, LLC Wichita Kansas 67207 —
Alliance for Multispecialty Research, LLC Lexington Kentucky 40509 —
Versailles Family Medicine / CCT Research Versailles Kentucky 40383 —
MedPharmics, LLC Lafayette Louisiana 70508 —
DelRicht Research New Orleans Louisiana 70115 —
Alliance for Multispecialty Research, LLC New Orleans Louisiana 70119 —
Louisiana State University Health Sciences Shreveport Shreveport Louisiana 71101 —
Pharmaron Baltimore Maryland 21201 —
Advanced Primary and Geriatric Care - CCT Research Rockville Maryland 20850 —
Jadestone Clinical Research Silver Spring Maryland 20904 —
Brigham and Women's Hospital Boston Massachusetts 02115 —
Boston Medical Center Boston Massachusetts 02118 —
ActivMed Practices and Research Methuen Massachusetts 01844 —
University of Massachusetts Chan Medical School Worcester Massachusetts 01655 —
Henry Ford Hospital Detroit Michigan 48202 —
Ascension St. John Hospital Grosse Pointe Woods Michigan 48236 —
Revival Research Institute, LLC Sterling Heights Michigan 48312 —
Oakland Medical Research Troy Michigan 48085 —
Arcturus Healthcare , PLC, Troy Internal Medicine Research Division Troy Michigan 48098 —
Clinical Research Professionals Chesterfield Missouri 63005 —
Bio-Kinetic Clinical Applications, LLD dba QPS-MO Springfield Missouri 65802 —
QPS Bio-Kinetic Clinical Applications (Patient Screening Only) Springfield Missouri 65807 —
Saint Louis University Center for Vaccine Development St Louis Missouri 63104 —
Sundance Clinical Research St Louis Missouri 63141 —
Bozeman Health Deaconess Hospital Bozeman Montana 59715 —
Methodist Physicians Clinic/CCT Research Fremont Nebraska 68025 —
Velocity Clinical Research, Grand Island Grand Island Nebraska 68803 —
Be Well Clinical Studies Lincoln Nebraska 68516 —
Velocity Clinical Research, Norfolk Norfolk Nebraska 68701 —
Quality Clinical Research Omaha Nebraska 68114 —
Velocity Clinical Research, Omaha Omaha Nebraska 68134 —
Papillion Research Center/CCT Research Papillion Nebraska 68046 —
Excel Clinical Research, LLC Las Vegas Nevada 89109 —
Santa Rosa Medical Centers of Nevada / CCT Research Las Vegas Nevada 89119 —
ActivMed Practices & Research, LLC. Portsmouth New Hampshire 03801 —
David Jurist Research Building Hackensack New Jersey 07601 —
Hackensack University Medical Center Medical Plaza Hackensack New Jersey 07601 —
Hackensack University Medical Center Hackensack New Jersey 07601 —
South Jersey Infectious Disease Somers Point New Jersey 08244 —
Albuquerque Clinical Trials, Inc. Albuquerque New Mexico 87102 —
Velocity Clinical Research, Albuquerque Albuquerque New Mexico 87107 —
Smith Allergy & Asthma Specialists Horseheads New York 14845 —
NYU Langone Health New York New York 10016 —
Rochester Clinical Research, LLC Rochester New York 14609 —
Velocity Clinical Research, Vestal Vestal New York 13850 —
Accellacare - Cary Cary North Carolina 27518 —
Accellacare - Charlotte Charlotte North Carolina 28211 —
Carolina Institute for Clinical Research Fayetteville North Carolina 28303 —
PharmQuest Life Sciences, LLC Greensboro North Carolina 27408 —
Accellacare - Hickory Hickory North Carolina 28601 —
Monroe Biomedical Research Monroe North Carolina 28112 —
Accellacare - Raleigh Raleigh North Carolina 27609 —
M3 Wake Research, Inc. Raleigh North Carolina 27612 —
Accellacare - Rocky Mount Rocky Mount North Carolina 27804 —
Accellacare - Salisbury Salisbury North Carolina 28144 —
Accellacare - Wilmington Wilmington North Carolina 28401 —
Trial Management Associates - Wilmington - Floral Parkway Wilmington North Carolina 28403 —
Accellacare - Winston-Salem Winston-Salem North Carolina 27103 —
Plains Clinical Research Center Fargo North Dakota 58104 —
Plains Medical Clinic, LLC Fargo North Dakota 58104 —
CTI Clinical Research Center Cincinnati Ohio 45212 —
Meridian Clinical Research, LLC Cincinnati Ohio 45219 —
Cincinnati Children's Hospital Medical Center Cincinnati Ohio 45229 —
University Hospitals Cleveland Medical Center Cleveland Ohio 44106 —
Senders Pediatrics Cleveland Ohio 44121 —
Velocity Clinical Research, Cleveland Cleveland Ohio 44122 —
Centricity Research Columbus Ohio Multispecialty Columbus Ohio 43213 —
Dayton Clinical Research Dayton Ohio 45409 —
WellNow Urgent Care & Research Dayton Ohio 45424 —
PriMED Clinical Research Dayton Ohio 45429 —
Tekton Research, LLC. Edmond Oklahoma 73013 —
Tekton Research, LLC. Moore Oklahoma 73160 —
Lynn Institute of Norman Norman Oklahoma 73072 —
Lynn Health Science Institute Oklahoma City Oklahoma 73112 —
Tekton Research, LLC. Yukon Oklahoma 73099 —
Velocity Clinical Research, Medford Medford Oregon 97504 —
Kaiser Permanente Northwest Center for Health Research Portland Oregon 97227 —
Lehigh Valley Health Network Allentown Pennsylvania 18102 —
Capital Area Research, LLC Camp Hill Pennsylvania 17011 —
Central Erie Primary Care Erie Pennsylvania 16508 —
Velocity Clinical Research, Providence East Greenwich Rhode Island 02818 —
Velocity Clinical Research, Anderson Anderson South Carolina 29621 —
Pharmacorp Clinical Trials Charleston South Carolina 29412 —
Velocity Clinical Research, Columbia Columbia South Carolina 29204 —
Velocity Clinical Research, Gaffney Gaffney South Carolina 29340 —
Tribe Clinical Research, LLC Greenville South Carolina 29607 —
Main Street Physician's Care Little River South Carolina 29566 —
Clinical Trials of South Carolina Moncks Corner South Carolina 29461 —
Trial Management Associates Myrtle Beach South Carolina 29572 —
Coastal Carolina Research Center North Charleston South Carolina 29405 —
Velocity Clinical Research, Spartanburg Spartanburg South Carolina 29303 —
Velocity Clinical Research, Union Union South Carolina 29379 —
Internal Medicine and Pediatric Associates of Bristol Bristol Tennessee 37620 —
WR-Clinsearch, LLC Chattanooga Tennessee 37421 —
Holston Medical Group Kingsport Tennessee 37660 —
Alliance for Multispecialty Research, LLC Knoxville Tennessee 37909 —
New Phase Research and Development Knoxville Tennessee 37909 —
Accellacare US Inc., d/b/a Accellacare of Knoxville Knoxville Tennessee 37912 —
Accellacare US Inc., d/b/a Accellacare of Knoxville Knoxville Tennessee 37938 —
Clinical Neuroscience Solutions Inc. Memphis Tennessee 38119 —
Elligo Clinical Research Center Austin Texas 78704 —
Benchmark Research Austin Texas 78705 —
Tekton Research, LLC. Austin Texas 78745 —
Orion Clinical Research Austin Texas 78759 —
Velocity Clinical Research, Austin Austin Texas 78759 —
Headlands Research - Brownsville Brownsville Texas 78526 —
WR-Global Medical Research, LLC Dallas Texas 75224 —
DFW Clinical Research Dallas Texas 75234 —
North Texas Infectious Diseases Consultants, P.A Dallas Texas 75246 —
Epic Medical Research - DeSoto DeSoto Texas 75115 —
Proactive Clinical Research, LLC Edinburg Texas 78539 —
Benchmark Research Fort Worth Texas 76135 —
Texas Health Family Care Fort Worth Texas 76135 —
Allure Health Friendswood Texas 77546 —
Trio Clinical Trials Houston Texas 77008 —
Juno Research Houston Texas 77040 —
Prolato Clinical Research Center Houston Texas 77054 —
DM Clinical Research - Bellaire Houston Texas 77081 —
Santa Clara Family Clinic Houston Texas 77087 —
Dynamed Clinical Research, LP d/b/a DM Clinical Research Humble Texas 77338 —
Andres Garcia Zuniga, M.D., P.A. Laredo Texas 78041 —
SMS Clinical Research Mesquite Texas 75149 —
AIM Trials, LLC Plano Texas 75093 —
Clinical Trials of Texas, LLC San Antonio Texas 78229 —
IMA Clinical Research San Antonio San Antonio Texas 78229 —
Tekton Research, LLC. San Antonio Texas 78229 —
Javara - Privia Medical Group North Texas - Stephenville Stephenville Texas 76401 —
Sugar Lakes Family Practice, PA Sugar Land Texas 77479 —
DM Clinical Research, Martin Diagnostic Clinic Tomball Texas 77375 —
Northwest Houston Heart Center Tomball Texas 77375 —
Crossroads Clinical Research Victoria Texas 77901 —
Cope Family Medicine / CCT Research Bountiful Utah 84010 —
South Ogden Family Medicine/ CCT Research Ogden Utah 84405 —
J. Lewis Research, Inc. / Foothill Family Clinic Salt Lake City Utah 84109 —
Olympus Family Medicine/CCT Research Salt Lake City Utah 84117 —
J. Lewis Research, Inc. / Foothill Family Clinic South Salt Lake City Utah 84121 —
J. Lewis Research, Inc. / Jordan River Family Medicine South Jordan Utah 84095 —
Springville Dermatology - Springville/CCT Research Springville Utah 84663 —
Velocity Clinical Research, Salt Lake City West Jordan Utah 84088 —
Clinical Alliance for Research and Education - Infectious Diseases (CARE-ID), LLC Annandale Virginia 22003 —
Charlottesville Medical Research Charlottesville Virginia 22911 —
Virginia Research Center Midlothian Virginia 23114 —
Health Research of Hampton Roads, Inc. Newport News Virginia 23606 —
Alliance for Multispecialty Research, LLC Norfolk Virginia 23502 —
Meridian Clinical Research LLC Portsmouth Virginia 23703 —
Clinical Research Partners, LLC Richmond Virginia 23226 —
Centricity Research Suffolk Primary Care Suffolk Virginia 23435 —
EvergreenHealth Medical Center Kirkland Washington 98034 —
EvergreenHealth Kirkland Washington 98034 —
Rainier Clinical Research Center Renton Washington 98057 —
Kaiser Permanente Washington Health Research Institute (KPWHRI) Seattle Washington 98101 —
Kaiser Permanente Washington Health Research Institute Seattle Washington 98101 —
Seattle Clinical Research Center Seattle Washington 98105 —
Allegiance Research Specialists, LLC Wauwatosa Wisconsin 53226 —

Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.

Non-U.S. locations

This page focuses on the U.S. directory. The official record also lists 58 non-U.S. sites.

About this trial record page

What this page shows
Public field values for ClinicalTrials.gov record NCT05540522, including study identification, conditions, interventions, eligibility (age, sex, healthy volunteer), timeline, and U.S. site list.
What this page does not do
No medical advice, eligibility judgments, treatment recommendations, study quality scoring, or AI-generated medical summaries. No site contact phone numbers, emails, or investigator names.
Where the data comes from
Sourced from the official ClinicalTrials.gov public API. The official record is the source of truth.
Last refresh
Last update posted May 8, 2025 · Synced Oct 22, 2026

Related: full search, browse by condition, browse by drug or therapy, browse by sponsor, browse by U.S. city.

Open the official record

The complete public registry record, listed eligibility criteria, and available contact information for NCT05540522 live on ClinicalTrials.gov.

View official ClinicalTrials.gov record →