Study type
Vaccine studies recruiting now
Vaccine trials test how well new or updated vaccines produce an immune response and how they are tolerated. Many recruit healthy adults; some focus on older adults, children or people with specific conditions.
115 recruiting studiesSource: ClinicalTrials.gov, refreshed October 26, 2026How we list studies
More recruiting studies (pay not posted)
- RecruitingHealthy volunteers
Can Stories Encourage the Elderly to Vaccinate? Combining Viewer-tailored Personal Narrative Videos With Informational Videos to Improve Vaccine Uptake Among Older Adults
Johns Hopkins Bloomberg School of Public Health
- Location
- New York, NY
- Eligibility basics
- Ages 50+
- RecruitingHealthy volunteersPhase 4
Characterization of Humoral and Cellular Immune Responses Elicited by Influenza Vaccination in Healthy Adults
University of Pennsylvania
- Location
- Philadelphia, PA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersPhase 4
MenB-FHbp or MenACWY-TT/MenB-FHbp Vaccine in MenB-4C Primed Young Adults
Emory University
- Location
- Atlanta, GA + 1 other US site
- Eligibility basics
- Ages 18–25
- RecruitingHealthy volunteersPhase 2
Immunogenicity of RSVPreF3 Vaccine in Immunocompromised Persons
Johns Hopkins University
- Location
- Baltimore, MD
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Educate and Improve Underserved Populations' Uptake and Completion of the HPV Vaccine
University of Colorado, Denver
- Location
- Denver, CO
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Connecting Friends and Health Workers to Boost COVID-19 Vaccination in Latino Communities
Johns Hopkins University
- Location
- Baltimore, MD
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
COVID-19 Health Adjustments in Nutrition, General Wellness, and Exercise
Indiana University
- Location
- Bloomington, IN
- Eligibility basics
- Ages 18–75
- RecruitingHealthy volunteers
A Study to Evaluate Community-Based Measures to Increase RSV Vaccine Use Among Latino Adults
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Engaging College Students in Developing and Testing a Video-based Intervention for HPV Vaccination Promotion
Michigan State University
- Location
- East Lansing, MI
- Eligibility basics
- Ages 18–26
- RecruitingHealthy volunteersPhase 4
Characterizing the Human Airway Immune Response to FluMist Vaccination
Washington University School of Medicine
- Location
- St Louis, MO
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteersPhase 2
Systems Investigation of Vaccine Responses in Aging and Frailty
Yale University
- Location
- New Haven, CT
- Eligibility basics
- Ages 21+
- RecruitingHealthy volunteersPhase 4
Vaccine Immunity and Inflammation in the Aging Person Living With HIV
Hennepin Healthcare Research Institute
- Location
- Minneapolis, MN
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Vaccine Confidence and Infodemic in Southeast Asia's Nusantara Sociocultural Sphere
University of California, Berkeley
- Location
- Berkeley, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersPhase 4
Immunogenicity of Gardasil-9 HPV Vaccine in People Living With HIV
Louisiana State University Health Sciences Center in New Orleans
- Location
- New Orleans, LA
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteers
Researchers At UC San Diego Are Learning About the Benefits of Human Milk and How It Influences Infant and Child Health
University of California, San Diego
- Location
- San Diego, CA
- Eligibility basics
- Ages 18+ · Women only
- RecruitingHealthy volunteers
RSV Vaccine Pregnancy Registry
CorEvitas
- Location
- Wilmington, NC
- Eligibility basics
- Ages 18–50 · Women only
- RecruitingHealthy volunteers
Triage Survey for Infectious Disease Eligibility
Brooklyn Clinical Research
- Location
- Brooklyn, NY
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersPhase 4
Bone Marrow and Peripheral Blood Immune Responses Study
Emory University
- Location
- Atlanta, GA
- Eligibility basics
- Ages 18–64
- RecruitingHealthy volunteersPhase 2
Phase 2 Safety and Immunogenicity Study of Rift Valley Fever Vaccine
U.S. Army Medical Research and Development Command
- Location
- Fort Deterick, MD
- Eligibility basics
- Ages 18–65
Who these studies look for
Vaccine studies often exclude people who recently received a related vaccine or had the infection, and those with conditions or medicines that affect the immune system.
Matching a page like this one never means you qualify. Each research team decides eligibility at screening.
Questions
Could I receive a placebo?
Often yes. Many vaccine trials are randomized, so some participants receive a comparison vaccine or placebo. The consent document explains this.