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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: mRNA-1273 Clear all
Completed No phase listed Observational

Pfizer-BioNTech COVID-19 Vaccine Effectiveness Study - Kaiser Permanente Southern California

NCT04848584
View directory record Official record
Conditions
COVID-19
Interventions
Primary Exposure Status of Pfizer-BioNTech COVID-19 Vaccine, BNT162b2 BA.4/5 bivalent, XBB.1.5-adapted vaccinated
Biological
Lead sponsor
Pfizer
Industry
Eligibility
0 Years and older
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2025
U.S. locations
1
States / cities
Pasadena, California
Source: ClinicalTrials.gov public record
Updated Jul 28, 2025 · Synced Sep 23, 2026, 5:24 PM EDT
Recruiting Phase 4 Interventional Accepts healthy volunteers

A Study to Investigate the Immunogenicity and Safety of mRNA COVID-19 Variant-containing Vaccine Formulations

NCT06585241
View directory record Official record
Conditions
SARS-CoV-2
Interventions
mRNA-1273 Variant-containing Formulation
Biological
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
6 Months and older
Enrollment
1,144 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
6
States / cities
Atlanta, Georgia • Decatur, Georgia • Baton Rouge, Louisiana + 3 more
Source: ClinicalTrials.gov public record
Updated Mar 26, 2026 · Synced Sep 23, 2026, 5:24 PM EDT
Terminated Phase 1Phase 2 Interventional Results available

High-Dose Moderna mRNA-1273 Booster Study for Lung Transplant Recipients

NCT05280158
View directory record Official record
Conditions
Lung Transplant Recipient, SARS-CoV-2, Immunosuppression
Interventions
mRNA-1273 (Moderna COVID-19 vaccine)
Drug
Lead sponsor
University of California, Los Angeles
Other
Eligibility
18 Years and older
Enrollment
19 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2023
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Mar 25, 2025 · Synced Sep 23, 2026, 5:24 PM EDT
Completed Phase 4 Interventional Results available

Vaccination for Recovered Inpatients With COVID-19 (VATICO)

NCT04969250
View directory record Official record
Conditions
Covid19
Interventions
Moderna mRNA-1273 COVID-19 vaccine, Pfizer BNT162b2 COVID-19 vaccine
Biological
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years and older
Enrollment
66 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
16
States / cities
Los Angeles, California • San Francisco, California • Stanford, California + 11 more
Source: ClinicalTrials.gov public record
Updated Mar 26, 2024 · Synced Sep 23, 2026, 5:24 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

A Study to Evaluate Safety and Immunogenicity of mRNA-1273 Vaccine to Prevent COVID-19 in Adult Organ Transplant Recipients and in Healthy Adult Participants

NCT04860297
View directory record Official record
Conditions
SARS-CoV-2
Interventions
mRNA-1273
Biological
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
18 Years and older
Enrollment
234 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
15
States / cities
Mesa, Arizona • San Diego, California • New Haven, Connecticut + 12 more
Source: ClinicalTrials.gov public record
Updated Jun 17, 2024 · Synced Sep 23, 2026, 5:24 PM EDT
Terminated No phase listed Observational Accepts healthy volunteers

Immune Responses in Oncology Patients to Novel Coronavirus Vaccines (IROC)

NCT04930055
View directory record Official record
Conditions
Cancer
Interventions
COVID-19 Vaccination
Biological
Lead sponsor
Indiana University
Other
Eligibility
18 Years and older
Enrollment
2,206 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
2
States / cities
Carmel, Indiana • Indianapolis, Indiana
Source: ClinicalTrials.gov public record
Updated May 18, 2023 · Synced Sep 23, 2026, 5:24 PM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers Results available

Delayed Heterologous SARS-CoV-2 Vaccine Dosing (Boost) After Receipt of EUA Vaccines

NCT04889209
View directory record Official record
Conditions
COVID-19
Interventions
Ad26.COV2.S, BNT162b2, mRNA-1273, mRNA-1273.211, mRNA-1273.222, SARS-CoV-2 rS/M1
Biological
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 99 Years
Enrollment
867 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
10
States / cities
Decatur, Georgia • Baltimore, Maryland • New York, New York + 6 more
Source: ClinicalTrials.gov public record
Updated Apr 19, 2025 · Synced Sep 23, 2026, 5:24 PM EDT
Active, not recruiting No phase listed Observational Accepts healthy volunteers

COVID-19 Vaccine Responses in PIDD Subjects

NCT05321407
View directory record Official record
Conditions
X-linked Agammaglobulinemia, XLA, Primary Immune Deficiency, CVID, Common Variable Immunodeficiency, Primary Antibody Deficiencies, Secondary Hypogammaglobulinemia
Interventions
Not listed
Lead sponsor
Duke University
Other
Eligibility
6 Months and older
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2026
U.S. locations
3
States / cities
St. Petersburg, Florida • Chapel Hill, North Carolina • Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Jun 2, 2025 · Synced Sep 23, 2026, 5:24 PM EDT
Terminated Phase 2 Interventional Accepts healthy volunteers Results available

Study to Evaluate the Safety, Reactogenicity, and Effectiveness of mRNA-1273.214 SARS-CoV-2 (COVID-19) Vaccine in Infants

NCT05584202
View directory record Official record
Conditions
SARS-CoV-2
Interventions
mRNA-1273.214, Placebo
Biological · Other
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
2 Months to 6 Months
Enrollment
68 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
39
States / cities
Bessemer, Alabama • Birmingham, Alabama • Tucson, Arizona + 34 more
Source: ClinicalTrials.gov public record
Updated Nov 25, 2025 · Synced Sep 23, 2026, 5:24 PM EDT
Not listed No phase listed Observational Accepts healthy volunteers

Quantification of Binding and Neutralizing Antibody Levels in COVID-19 Vaccinated Health Care Workers Over 1 Year

NCT04910971
View directory record Official record
Conditions
COVID-19 Vaccine, Corona Virus Infection, Vaccine Adverse Reaction, Vaccine Response, Inflammation, Thrombosis
Interventions
Not listed
Lead sponsor
LifeBridge Health
Other
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jun 1, 2021 · Synced Sep 23, 2026, 5:24 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers

A Study to Evaluate the Safety and Immunogenicity of the mRNA COVID-19 Vaccines in Healthy Children Between 6 Months to Less Than 6 Years of Age

NCT05436834
View directory record Official record
Conditions
SARS-CoV-2
Interventions
mRNA-1273.214, mRNA-1273.815
Biological
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
6 Months to 5 Years
Enrollment
1,807 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2025
U.S. locations
48
States / cities
Bessemer, Alabama • Banning, California • Montebello, California + 38 more
Source: ClinicalTrials.gov public record
Updated Nov 25, 2025 · Synced Sep 23, 2026, 5:24 PM EDT
Completed Phase 2 Interventional Results available

COVID Protection After Transplant-Immunosuppression Reduction

NCT05077254
View directory record Official record
Conditions
Kidney Transplant Recipients, Liver Transplant Recipients
Interventions
Pfizer-BioNTech COVID-19 Vaccine 2023-2024, Moderna COVID-19 Vaccine 2023-2024, SOC IS Regimen, SOC IS Reduction
Biological · Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years and older
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2025
U.S. locations
15
States / cities
San Diego, California • San Francisco, California • Atlanta, Georgia + 10 more
Source: ClinicalTrials.gov public record
Updated Apr 22, 2026 · Synced Sep 23, 2026, 5:24 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Safety, Tolerability, and Immunogenicity of V110 or V114 Co-administered With a Booster Dose of mRNA-1273 in Healthy Adults (V110-911)

NCT05158140
View directory record Official record
Conditions
Pneumococcal Infection
Interventions
V110, V114, mRNA-1273, Placebo for V110, Placebo for V114
Biological
Lead sponsor
Merck Sharp & Dohme LLC
Industry
Eligibility
50 Years and older
Enrollment
850 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
42
States / cities
North Hollywood, California • Northridge, California • Paramount, California + 38 more
Source: ClinicalTrials.gov public record
Updated Jul 17, 2025 · Synced Sep 23, 2026, 5:24 PM EDT
Completed No phase listed Observational

A Study to Compare mRNA-1273 Versus BNT162b2 COVID-19 Vaccines Among Immunocompromised Adults

NCT05366322
View directory record Official record
Conditions
SARS-CoV-2
Interventions
Not listed
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
18 Years and older
Enrollment
124,879 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated May 8, 2022 · Synced Sep 23, 2026, 5:24 PM EDT
Completed Phase 2 Interventional Results available

COVID-19 Protection After Transplant Pilot Study

NCT04969263
View directory record Official record
Conditions
Kidney Transplant Recipients
Interventions
BNT162b2 vaccine (Pfizer/BioNTech), mRNA-1273 vaccine (Moderna)
Biological
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years and older
Enrollment
81 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 29, 2025 · Synced Sep 23, 2026, 5:24 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

COVID-19 Variant Immunologic Landscape Trial (COVAIL Trial)

NCT05289037
View directory record Official record
Conditions
COVID-19
Interventions
AS03, BNT162b2, BNT162b2 (B.1.1.529), BNT162b2 (B.1.351), BNT162b2 bivalent (wildtype and Omicron BA.1), BNT162b2 bivalent (wildtype and Omicron BA.4/BA.5), CoV2 preS dTM [B.1.351], CoV2 preS dTM/D614, CoV2 preS dTM/D614+B.1.351, mRNA-1273, mRNA-1273.351, mRNA-1273.529, mRNA-1273.617.2, Sodium Chloride, 0.9%
Drug · Biological · Other
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years and older
Enrollment
1,270 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
22
States / cities
Birmingham, Alabama • San Diego, California • San Francisco, California + 15 more
Source: ClinicalTrials.gov public record
Updated Oct 19, 2025 · Synced Sep 23, 2026, 5:24 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 23, 2026, 5:24 PM EDT
Terminated No phase listed Observational Accepts healthy volunteers

Moderna COVID-19 Vaccine mRNA-1273 Observational Pregnancy Outcome Study

NCT04958304
View directory record Official record
Conditions
SARS-CoV-2
Interventions
Not listed
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
18 Years and older · Female only
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Nov 27, 2023 · Synced Sep 23, 2026, 5:24 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

A Study of SARS CoV-2 Infection and Potential Transmission in Individuals Immunized With Moderna COVID-19 Vaccine

NCT04811664
View directory record Official record
Conditions
SARS-CoV-2 Infection
Interventions
Moderna COVID-19 Vaccine
Biological
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 29 Years
Enrollment
1,923 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
51
States / cities
Birmingham, Alabama • Scottsdale, Arizona • Tempe, Arizona + 45 more
Source: ClinicalTrials.gov public record
Updated Aug 1, 2023 · Synced Sep 23, 2026, 5:24 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Safety of Simultaneous mRNA COVID-19 Vaccine With Other Childhood Vaccines in Young Children

NCT06038617
View directory record Official record
Conditions
Fever After Vaccination, Fever, Seizures Fever
Interventions
mRNA COVID-19 Vaccine, Routine Childhood Vaccinations
Biological
Lead sponsor
Duke University
Other
Eligibility
6 Months to 4 Years
Enrollment
347 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2025
U.S. locations
5
States / cities
Oakland, California • Atlanta, Georgia • New York, New York + 2 more
Source: ClinicalTrials.gov public record
Updated May 12, 2026 · Synced Sep 23, 2026, 5:24 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 23, 2026, 5:24 PM EDT
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers Results available

A Study to Evaluate the Immunogenicity and Safety of mRNA Vaccine Boosters for SARS-CoV-2 (COVID-19) Variants

NCT04927065
View directory record Official record
Conditions
SARS-CoV-2
Interventions
mRNA-1273.211, mRNA-1273, mRNA-1273.617.2, mRNA-1273.213, mRNA-1273.529, mRNA-1273.214, mRNA-1273.222, mRNA-1273.815, mRNA-1273.231
Biological
Lead sponsor
ModernaTX, Inc.
Industry
Eligibility
18 Years and older
Enrollment
5,161 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
23
States / cities
Sacramento, California • Hollywood, Florida • Jacksonville, Florida + 18 more
Source: ClinicalTrials.gov public record
Updated Feb 27, 2025 · Synced Sep 23, 2026, 5:24 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 23, 2026, 5:24 PM EDT
Terminated Phase 2 Interventional Results available

Booster Dose Trial

NCT05016622
View directory record Official record
Conditions
Cancer
Interventions
BNT162b2 vaccine
Biological
Lead sponsor
Montefiore Medical Center
Other
Eligibility
18 Years and older
Enrollment
106 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Jul 30, 2024 · Synced Sep 23, 2026, 5:24 PM EDT