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Showing 1–24 of 147 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: mRNA COVID-19 Clear all
Completed Phase 3 Interventional Accepts healthy volunteers Results available

A Study on the Immune Response and Safety of a Vaccine Against Respiratory Syncytial Virus (RSV) When Given Alone and Together With a COVID-19 mRNA Vaccine in Adults Aged 50 Years and Above

NCT06374394
View directory record Official record
Conditions
Respiratory Syncytial Virus Infections
Interventions
RSVPreF3 OA investigational vaccine, COVID-19 mRNA vaccine
Biological
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
50 Years and older
Enrollment
841 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
8
States / cities
Coral Gables, Florida • Savannah, Georgia • Evansville, Indiana + 5 more
Source: ClinicalTrials.gov public record
Updated Dec 25, 2025 · Synced Sep 9, 2026, 9:22 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Adjuvant Effect of Physical Exercise on Immune Response to COVID-19 Vaccination and Interactions With Stress

NCT05213000
View directory record Official record
Conditions
Immunization
Interventions
Exercise
Behavioral
Lead sponsor
Iowa State University
Other
Eligibility
18 Years to 64 Years
Enrollment
80 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2026
U.S. locations
1
States / cities
Ames, Iowa
Source: ClinicalTrials.gov public record
Updated Aug 23, 2023 · Synced Sep 9, 2026, 9:22 PM EDT
Completed No phase listed Observational

Immunogenicity of COVID-19 Vaccine in Patients With Inflammatory Bowel Disease

NCT04818892
View directory record Official record
Conditions
IBD, Covid19 Vaccine
Interventions
Serological Assay for SARS-CoV-2
Diagnostic Test
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
18 Years to 85 Years
Enrollment
222 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Dec 6, 2022 · Synced Sep 9, 2026, 9:22 PM EDT
Completed No phase listed Observational

mRNA Based-Covid-19 Vaccine Effects on Blood Glucose Levels

NCT04923386
View directory record Official record
Conditions
Diabetes Mellitus, Type 2, Diabetes Mellitus, Type 1, Hyperglycemia, Vaccine Adverse Reaction
Interventions
None (not interventional)
Other
Lead sponsor
Levenson, David I., M.D.
Individual
Eligibility
18 Years and older
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
Boca Raton, Florida
Source: ClinicalTrials.gov public record
Updated Aug 16, 2022 · Synced Sep 9, 2026, 9:22 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Comparative Immunogenicity of Concomitant vs Sequential mRNA COVID-19 and Influenza Vaccinations

NCT06020118
View directory record Official record
Conditions
Influenza, COVID-19
Interventions
Simultaneous Vaccination (Influenza Vaccine and mRNA COVID booster), Sequential Vaccination (Influenza vaccine then mRNA COVID booster), Sequential Vaccination (mRNA COVID booster then Influenza vaccine)
Biological
Lead sponsor
Duke University
Other
Eligibility
6 Years to 64 Years
Enrollment
455 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
8
States / cities
Phoenix, Arizona • Tempe, Arizona • Atlanta, Georgia + 4 more
Source: ClinicalTrials.gov public record
Updated Jun 12, 2025 · Synced Sep 9, 2026, 9:22 PM EDT
Completed Phase 2 Interventional Results available

The Safety of Administering a Second Dose of a COVID-19 mRNA Vaccine in Individuals Who Experienced a Systemic Allergic Reaction to an Initial Dose

NCT04977479
View directory record Official record
Conditions
Systemic Allergic Reaction
Interventions
Pfizer-BioNTech COVID-19 Vaccine (Comirnaty), Placebo, Pfizer-BioNTech COVID-19 Vaccine, Bivalent
Biological · Other
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
16 Years to 69 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 15, 2023 · Synced Sep 9, 2026, 9:22 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

A Study to Evaluate Efficacy, Safety, and Immunogenicity of mRNA-1273 Vaccine in Adults Aged 18 Years and Older to Prevent COVID-19

NCT04470427
View directory record Official record
Conditions
SARS-CoV-2
Interventions
mRNA-1273, Placebo
Biological
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
18 Years and older
Enrollment
30,415 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
100
States / cities
Birmingham, Alabama • Chandler, Arizona • Glendale, Arizona + 79 more
Source: ClinicalTrials.gov public record
Updated Mar 20, 2024 · Synced Sep 9, 2026, 9:22 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

COVID-19 Study to Assess Immunogenicity, Safety, and Tolerability of Moderna mRNA-1273 Vaccine Administered With Casirivimab+Imdevimab in Healthy Adult Volunteers

NCT04852978
View directory record Official record
Conditions
Healthy, Chronic Stable Illness
Interventions
casirivimab+imdevimab, Moderna mRNA-1273 vaccine
Drug · Biological
Lead sponsor
Regeneron Pharmaceuticals
Industry
Eligibility
18 Years to 90 Years
Enrollment
295 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
6
States / cities
Little Rock, Arkansas • Rogers, Arkansas • Hialeah, Florida + 3 more
Source: ClinicalTrials.gov public record
Updated Oct 19, 2025 · Synced Sep 9, 2026, 9:22 PM EDT
Recruiting Phase 4 Interventional Accepts healthy volunteers

Covid-19 Long Haul Preventative and Health Promotion Care Clinical Trial Acceleration Program.

NCT06441955
View directory record Official record
Conditions
COVID-19, Long Haul
Interventions
Ritonavir-Boosted Nirmatrelvir (Paxlovid), Physiological Evaluation, Moderna COVID-19 Vaccine, Biopsychological, Behavioral (e.g., Psychotherapy, Lifestyle Counseling), Genetic (including gene transfer, stem cell and recombinant DNA), Multidisciplinary approach
Drug · Diagnostic Test · Biological + 3 more
Lead sponsor
Well- Konnect Healthcare Services and Research Firm
Network
Eligibility
18 Years to 65 Years
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2030
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Nov 26, 2024 · Synced Sep 9, 2026, 9:22 PM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

The Impact of COVID-19 on Maternal and Neonatal Outcomes

NCT05197621
View directory record Official record
Conditions
COVID-19, Pregnancy; Infection
Interventions
mRNA COVID-19 vaccine (Pfizer or Moderna)
Biological
Lead sponsor
Johns Hopkins University
Other
Eligibility
14 Years to 55 Years · Female only
Enrollment
300 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2028
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated May 10, 2026 · Synced Sep 9, 2026, 9:22 PM EDT
Terminated Phase 2 Interventional Accepts healthy volunteers Results available

A Ph 2 Trial With an Oral Tableted COVID-19 Vaccine

NCT05067933
View directory record Official record
Conditions
COVID-19
Interventions
VXA-CoV2-1.1-S, Placebo Tablets
Drug · Other
Lead sponsor
Vaxart
Industry
Eligibility
18 Years to 75 Years
Enrollment
66 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
4
States / cities
Long Beach, California • Wichita, Kansas • Cleveland, Ohio + 1 more
Source: ClinicalTrials.gov public record
Updated Apr 12, 2025 · Synced Sep 9, 2026, 9:22 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers

A Study to Learn About BNT162b2 (LP.8.1)-Adapted Vaccine Against SARS-CoV-2 in Children 5 Through 11 Years of Age That Are Considered at Higher Risk of Severe COVID-19

NCT07222384
View directory record Official record
Conditions
COVID-19, SARS-COV-2 Infection
Interventions
BNT162b2 (2025/2026 formulation)
Biological
Lead sponsor
BioNTech SE
Industry
Eligibility
5 Years to 11 Years
Enrollment
344 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
27
States / cities
Palo Alto, California • San Diego, California • Homestead, Florida + 21 more
Source: ClinicalTrials.gov public record
Updated Aug 6, 2026 · Synced Sep 9, 2026, 9:22 PM EDT
Completed No phase listed Observational Results available

This Study Intends to Describe the Characteristics of Patients Given the Pfizer-BioNTech Bivalent mRNA COVID-19 Vaccine and Any Commercially Available Influenza Vaccines at the Same Time Versus at Different Times.

NCT05858450
View directory record Official record
Conditions
Influenza, Human, COVID-19
Interventions
Comirnaty, Quadrivalent Influenza Vaccine
Biological
Lead sponsor
Pfizer
Industry
Eligibility
18 Years and older
Enrollment
3,442,996 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Sep 19, 2024 · Synced Sep 9, 2026, 9:22 PM EDT
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers Results available

A Study to Evaluate the Safety, Reactogenicity, and Effectiveness of mRNA-1273 Vaccine in Adolescents 12 to <18 Years Old to Prevent COVID-19

NCT04649151
View directory record Official record
Conditions
SARS-CoV-2
Interventions
mRNA-1273, Placebo, mRNA-1273.222
Biological
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
12 Years to 18 Years
Enrollment
4,328 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2024
U.S. locations
48
States / cities
Banning, California • La Mesa, California • Lake Worth, Florida + 41 more
Source: ClinicalTrials.gov public record
Updated Sep 14, 2025 · Synced Sep 9, 2026, 9:22 PM EDT
Not listed Phase 2Phase 3 Interventional Accepts healthy volunteers

PROSPECTIVE OPEN LABEL CLINICAL TRIAL TO ADMINISTER A BOOSTER DOSE OF PFIZER/BIONTECH OR MODERNA COVID-19 VACCINE IN HIGH-RISK INDIVIDUALS

NCT05279365
View directory record Official record
Conditions
SARS CoV 2 Infection, COVID-19
Interventions
Pfizer/BioNTech (BNT162b2), Moderna
Biological
Lead sponsor
DHR Health Institute for Research and Development
Other
Eligibility
18 Years and older
Enrollment
1,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
4
States / cities
Brownsville, Texas • Edinburg, Texas • Rio Grande City, Texas
Source: ClinicalTrials.gov public record
Updated Mar 28, 2022 · Synced Sep 9, 2026, 9:22 PM EDT
Not listed No phase listed Observational Accepts healthy volunteers

The COVID-19 Back-to-Normal Study: Analysis of Multiple Outcomes

NCT04832932
View directory record Official record
Conditions
COVID-19 Vaccines
Interventions
COVID-19 vaccines
Biological
Lead sponsor
Mebo Research, Inc.
Other
Eligibility
18 Years and older
Enrollment
2,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2025
U.S. locations
2
States / cities
Miami, Florida • Vonore, Tennessee
Source: ClinicalTrials.gov public record
Updated Jan 25, 2024 · Synced Sep 9, 2026, 9:22 PM EDT
Completed No phase listed Observational Results available

Patient Experiences With the COVID-19 Vaccination After Breast Cancer Treatment

NCT04872738
View directory record Official record
Conditions
Breast Cancer Related Lymphedema, Covid19
Interventions
Survey
Other
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years and older · Female only
Enrollment
714 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jan 5, 2026 · Synced Sep 9, 2026, 9:22 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

A Study of mRNA-1083 (SARS-CoV-2 and Influenza) Vaccine in Healthy Adult Participants, ≥50 Years of Age

NCT06097273
View directory record Official record
Conditions
SARS-CoV-2, Influenza
Interventions
mRNA-1083, Placebo, Influenza Vaccine, COVID-19 Vaccine
Biological
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
50 Years and older
Enrollment
8,061 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
146
States / cities
Anniston, Alabama • Birmingham, Alabama • Cullman, Alabama + 122 more
Source: ClinicalTrials.gov public record
Updated Jun 30, 2025 · Synced Sep 9, 2026, 9:22 PM EDT
Active, not recruiting Phase 4 Interventional Accepts healthy volunteers

A Study to Evaluate the Efficacy and Safety of mRNA-1283 and mRNA-1273 in Participants 50 to 64 Years of Age Without High-Risk Conditions for Severe Coronavirus Disease 2019 (COVID-19)

NCT07266558
View directory record Official record
Conditions
SARS-CoV-2
Interventions
mRNA-1273, mRNA-1283, Placebo
Biological
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
50 Years to 64 Years
Enrollment
30,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2027
U.S. locations
150
States / cities
Birmingham, Alabama • Cullman, Alabama • Mobile, Alabama + 127 more
Source: ClinicalTrials.gov public record
Updated Apr 27, 2026 · Synced Sep 9, 2026, 9:22 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Phase 1 Study to Assess the Safety and Immunogenicity of JCXH-221, an MRNA-based Broadly Protective COVID-19 Vaccine

NCT05743335
View directory record Official record
Conditions
COVID-19, Infectious Disease
Interventions
JCXH-221, Placebo
Biological · Other
Lead sponsor
Immorna Biotherapeutics, Inc.
Industry
Eligibility
18 Years and older
Enrollment
73 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023
U.S. locations
4
States / cities
Hallandale, Florida • Savannah, Georgia • Lincoln, Nebraska + 1 more
Source: ClinicalTrials.gov public record
Updated Sep 18, 2024 · Synced Sep 9, 2026, 9:22 PM EDT
Active, not recruiting Phase 4 Interventional Accepts healthy volunteers

Comparative Immunogenicity of Respiratory Virus Vaccines (CIRV2) Study

NCT07287137
View directory record Official record
Conditions
COVID -19, COVID - 19, COVID 19, Influenza, Respiratory Virus, Respiratory Viruses, Respiratory Virus Infection, Respiratory Virus Infections
Interventions
Pfizer-BioNTech mRNA COVID-19 vaccine, Novavax recombinant protein vaccine
Drug
Lead sponsor
Henry M. Jackson Foundation for the Advancement of Military Medicine
Other
Eligibility
18 Years to 79 Years
Enrollment
54 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2027
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated May 3, 2026 · Synced Sep 9, 2026, 9:22 PM EDT
Terminated Phase 2 Interventional Results available

COVID-19 Booster Vaccine in Autoimmune Disease Non-Responders

NCT05000216
View directory record Official record
Conditions
Rheumatoid Arthritis (RA), Systemic Lupus Erythematosus (SLE), Pemphigus Vulgaris, Multiple Sclerosis (MS), Systemic Sclerosis (SSc), Pediatric SLE, Juvenile Idiopathic Arthritis (JIA), Juvenile Dermatomyositis (JDM), Pediatric-Onset Multiple Sclerosis (POMS)
Interventions
Moderna mRNA-1273, BNT162b2, Ad26.COV2.S, Continue IS (MMF or MPA), Continue IS (MTX), Continue IS (B cell depletion therapy), Monovalent [B.1.351] CoV2 preS dTM-AS03, Withhold IS (MMF or MPA), Withhold IS (MTX), Withhold IS (B cell depletion therapy), Moderna mRNA-1273, Bivalent, BNT162b2, Bivalent
Biological · Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
2 Years and older
Enrollment
258 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2024
U.S. locations
29
States / cities
Los Angeles, California • New Haven, Connecticut • Atlanta, Georgia + 18 more
Source: ClinicalTrials.gov public record
Updated Jun 9, 2026 · Synced Sep 9, 2026, 9:22 PM EDT
Completed Phase 2 Interventional

A Vaccine Booster (GEO-CM04S1) for the Prevention of COVID-19 in Patients With Chronic Lymphocytic Leukemia

NCT05672355
View directory record Official record
Conditions
Chronic Lymphocytic Leukemia, COVID-19 Infection
Interventions
Biospecimen Collection, mRNA COVID-19 Vaccine, Synthetic MVA-based SARS-CoV-2 Vaccine COH04S1
Procedure · Biological
Lead sponsor
City of Hope Medical Center
Other
Eligibility
18 Years and older
Enrollment
47 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2026
U.S. locations
1
States / cities
Duarte, California
Source: ClinicalTrials.gov public record
Updated Sep 8, 2026 · Synced Sep 9, 2026, 9:22 PM EDT
Not listed No phase listed Observational

Sustained Humoral and Cell-Mediated Immunogenicity of COVID-19 Vaccines in Patients With Inflammatory Bowel Disease

NCT05014555
View directory record Official record
Conditions
Inflammatory Bowel Diseases
Interventions
COVID-19 Vaccine
Biological
Lead sponsor
GI Alliance
Other
Eligibility
18 Years to 85 Years
Enrollment
400 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
4
States / cities
Jacksonville, Florida • Baton Rouge, Louisiana • Southlake, Texas + 1 more
Source: ClinicalTrials.gov public record
Updated Jun 17, 2023 · Synced Sep 9, 2026, 9:22 PM EDT