Immunization Clinical Trials

23 recruitingLast updated: May 13, 2026

There are 23 actively recruiting immunization clinical trials across 19 countries. Studies span Not Applicable, Phase 2, Phase 3, Phase 1, Phase 4. Top locations include Tegucigalpa, Honduras, San Pedro Sula, Honduras, Nashville, Tennessee, United States. Updated daily from ClinicalTrials.gov.


Immunization Trials at a Glance

23 actively recruiting trials for immunization are listed on ClinicalTrialsFinder across 6 cities in 19 countries. The largest study group is Not Applicable with 7 trials, with the heaviest enrollment activity in Tegucigalpa, San Pedro Sula, and Nashville. Lead sponsors running immunization studies include Sanofi, Vanderbilt University Medical Center, and Indiana University.

Browse immunization trials by phase

Treatments under study

About Immunization Clinical Trials

Looking for clinical trials for Immunization? There are currently 4 studies actively recruiting participants. Clinical trials offer access to new treatments before they are widely available, and every approved therapy in use today was first tested through a clinical trial.

Below you can browse trials, sign up for alerts when new Immunization trials open, and view eligibility criteria for each study. Each listing includes the study phase, locations, and enrollment details.

Frequently Asked Questions

Common questions about Immunization clinical trials

A clinical trial is a carefully designed research study that tests new medical treatments, drugs, devices, or approaches in human volunteers. Every approved medication and treatment available today was proven safe and effective through clinical trials.

All clinical trials are reviewed and approved by Institutional Review Boards (IRBs) — independent committees that evaluate patient safety. Trials follow strict protocols, and your health is monitored closely throughout. You can withdraw at any time.

Not necessarily. Many trials compare the new treatment against the current standard of care, meaning all participants receive active treatment. When placebos are used, they are typically combined with standard treatment, not given alone. The trial description will always specify the design.

Under the Affordable Care Act, most private insurers are required to cover routine patient care costs during a clinical trial. The sponsor typically covers the investigational treatment itself. Medicare also covers routine costs for qualifying trials.

Yes. Participation is completely voluntary. You can withdraw at any time, for any reason, without it affecting your access to standard medical care.

Each trial has specific eligibility criteria — including age, diagnosis, disease stage, prior treatments, and general health. Browse the trials listed above and check their eligibility sections. You can also contact the trial site directly to discuss your situation.

Showing 120 of 23 trials

Recruiting
Phase 3

A Phase III Control Study of the Safety and Immunogenicity of vYF in Pediatric Population

Yellow Fever Immunization
Sanofi2,440 enrolled13 locationsNCT07103148
Recruiting
Phase 3

Lot-to-lot Consistency Study of a 21-valent Pneumococcal Conjugate Vaccine in Healthy Infants From 2 Months of Age

Healthy VolunteersPneumococcal Immunization
Sanofi2,195 enrolled6 locationsNCT07348692
Recruiting
Phase 2

High vs.Standard Dose Influenza Vaccine in Pediatric Solid Organ Transplant (SOT) Recipients

InfluenzaTransplantation InfectionImmunization; Infection
National Institute of Allergy and Infectious Diseases (NIAID)312 enrolled8 locationsNCT05947071
Recruiting
Phase 1Phase 2

Phase 1/2 Study of Chlamydia Trachomatis mRNA Vaccine in Adults Aged 18 to 29 Years

Chlamydia Trachomatis Immunization
Sanofi1,560 enrolled7 locationsNCT06891417
Recruiting
Not Applicable

Influenza Immunization in Adults Over Age 75

Older AdultsInfluenzaImmunization+1 more
Johns Hopkins University1,025 enrolled1 locationNCT02200276
Recruiting

Preparing for Maternal GBS Vaccine Trials in Africa

Invasive Bacterial Diseases (IBD)Group B StreptococcusMaternal Immunization
Barcelona Institute for Global Health18,100 enrolled9 locationsNCT06833957
Recruiting

A Study to Learn More About Prevenar 20 Once it is Out in the Korean Market

SafetyPneumococcal Immunization
Pfizer660 enrolled1 locationNCT06760208
Recruiting
Phase 3

Study of the Safety of a 21-valent Pneumococcal Conjugate Vaccine in Healthy Infants From Approximately 2 Months of Age

Pneumococcal Immunization
Sanofi2,320 enrolled134 locationsNCT06824194
Recruiting

Hemophilia A Research Program

PregnancyHemophilia APregnancy Complications+10 more
University of Washington500 enrolled1 locationNCT07414511
Recruiting

Innate Immune Response Monitoring Via Monocyte HLA-DR in Severe Intra-abdominal Infections at Risk of Fungal Infection

Critical IllnessIntra-Abdominal InfectionPost-Op Infection+2 more
Central Hospital, Nancy, France100 enrolled1 locationNCT07130799
Recruiting
Not Applicable

The Effect of HPV Education Provided to Women on Their Knowledge Levels, HPV Screening, and Vaccination Uptake

HPV (Human Papillomavirus)-AssociatedHPV Immunization Status
Ufuk University64 enrolled1 locationNCT07320157
Recruiting
Phase 2

High vs. Standard Dose Influenza Vaccine in Lung Allograft Recipients

InfluenzaTransplantation InfectionImmunization; Infection
Vanderbilt University Medical Center270 enrolled1 locationNCT05215327
Recruiting

COVID-19 Health Adjustments in Nutrition, General Wellness, and Exercise

Physical InactivityBlood PressureSleep+4 more
Indiana University100 enrolled1 locationNCT07128095
Recruiting
Phase 4

Comparing Immune Response of 2 vs 3 HPV Doses (27-45 Years Old)

Human PapillomavirusHPV InfectionImmunization
The University of Texas Medical Branch, Galveston618 enrolled1 locationNCT05672927
Recruiting
Phase 2

High vs. Standard Dose Influenza Vaccines in Lung Transplant (Repeater)

InfluenzaImmunization; Infection|Transplantation Infection|Influenza
Vanderbilt University Medical Center60 enrolled1 locationNCT07192458
Recruiting
Not Applicable

A Study to Evaluate Community-Based Measures to Increase RSV Vaccine Use Among Latino Adults

vaccine uptakeOlder Adults Without Any Specific Clinical ConditionSocial Networks+1 more
University of California, San Francisco750 enrolled1 locationNCT07171164
Recruiting
Phase 1Phase 2

Immunogenicity of Yellow Fever Vaccine 17D in Adults With Prior 17D Vaccination

Yellow FeverImmunization; Infection
Oregon Health and Science University35 enrolled1 locationNCT05859490
Recruiting
Not Applicable

Description of the Immune Response to Yellow Fever Vaccination

InfectionsImmunization
Institut Pasteur38 enrolled1 locationNCT06718127
Recruiting
Not Applicable

OPTIMIZING ROUTINE DELIVERY OF ESSENTIAL CHILD HEALTH AND NUTRITION PACKAGE THROUGH PRIMARY HEALTH CARE CONTACTS

Coverage of Vitamin A SupplementationCoverage of ImmunizationFeasibility and Fidelity of Implementation
Nutrition International1,928 enrolled2 locationsNCT06949930
Recruiting
Phase 3

Clinical Study to Assess the Immunogenicity and Safety of Hexavalent Vaccine Containing Reduced Dose IPV

Diptheria ImmunizationTetanus ImmunizationPertussis Immunization+3 more
Serum Institute of India Pvt. Ltd.1,557 enrolled9 locationsNCT06413121