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Showing 1–24 of 31 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Impact of Vaccination Clear all
Completed Not applicable Interventional Accepts healthy volunteers

Quality Improvement Strategies to Increase Human Papillomavirus (HPV) Vaccination

NCT03442062
View directory record Official record
Conditions
Human Papillomavirus Infection
Interventions
Assessment Feedback Incentives and eXchange, Physician-to-physician engagement, Active Intervention Control
Other
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
Not listed
Enrollment
264 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2020
U.S. locations
3
States / cities
Phoenix, Arizona • Albany, New York • Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated May 10, 2020 · Synced Jul 22, 2026, 11:48 AM EDT
Completed No phase listed Observational Accepts healthy volunteers Results available

Assessing Choice in the Employer Setting (ACES) Study

NCT00808808
View directory record Official record
Conditions
Healthy
Interventions
Choice of TIV or FluMist with baseline advertisement, Choice of TIV or FluMist with enhanced advertisement and incentives, Control - Usual care offering TIV only with baseline advertisement
Biological · Other
Lead sponsor
MedImmune LLC
Industry
Eligibility
18 Years and older
Enrollment
4,411 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008
U.S. locations
47
States / cities
Chatsworth, California • Novato, California • Sacramento, California + 34 more
Source: ClinicalTrials.gov public record
Updated Nov 19, 2013 · Synced Jul 22, 2026, 11:48 AM EDT
Recruiting Not applicable Interventional

Community Care Intervention to Decrease COVID-19 Vaccination Inequities

NCT06156254
View directory record Official record
Conditions
COVID-19 Vaccination
Interventions
Community Health Worker Intervention to Enhance Vaccination Behavior (CHW-VB)
Behavioral
Lead sponsor
RAND
Other
Eligibility
18 Years and older
Enrollment
800 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2026
U.S. locations
4
States / cities
Brooklyn, New York • New York, New York • The Bronx, New York
Source: ClinicalTrials.gov public record
Updated May 14, 2026 · Synced Jul 22, 2026, 11:48 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

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

NCT07171164
View directory record Official record
Conditions
Older Adults Without Any Specific Clinical Condition, Social Networks, RSV Immunization, Vaccine Uptake
Interventions
Motivate Aim: CHW text message reminders and counseling, Motivate Aim: CHW text message reminders only, Activate Aim: CHW text message reminders and counseling, Activate Aim: CHW text message reminders only
Behavioral
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years and older
Enrollment
750 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2028
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Sep 29, 2025 · Synced Jul 22, 2026, 11:48 AM EDT
Completed Early Phase 1 Interventional

Safety and Efficacy of ProQuad® in Children 6-24 Month Being Evaluated for Solid Organ Transplant

NCT02687763
View directory record Official record
Conditions
RENAL INSUFFICIENCY, CHRONIC, LIVER FAILURE, ACUTE, HEART DISEASE
Interventions
ProQuad
Biological
Lead sponsor
Medical University of South Carolina
Other
Eligibility
6 Months to 24 Months
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Feb 11, 2019 · Synced Jul 22, 2026, 11:48 AM EDT
Active, not recruiting Not applicable Interventional

Impact of Adolescent Vaccine Reminder Notices Sent Via Preferred Method of Communication on HPV Vaccination

NCT05148559
View directory record Official record
Conditions
Papillomavirus Vaccines
Interventions
Reminder Sent Via Preferred Method of Communication, Reminder Sent Via Mailed Letter
Behavioral
Lead sponsor
Huong Nguyen, PhD
Other
Eligibility
12 Years to 12 Years
Enrollment
5,451 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2026
U.S. locations
1
States / cities
Marshfield, Wisconsin
Source: ClinicalTrials.gov public record
Updated Nov 20, 2025 · Synced Jul 22, 2026, 11:48 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Impact and Cost of a Pharmacist Pneumococcal Vaccination Program With PNEUMOVAX® 23 at an Urban Senior Center

NCT01944462
View directory record Official record
Conditions
Study is Open to Seniors Age 50 or Older
Interventions
Pharmacist Pneumococcal Vaccine Program (PPVP)
Behavioral
Lead sponsor
Thomas Jefferson University
Other
Eligibility
50 Years and older
Enrollment
203 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jan 2, 2018 · Synced Jul 22, 2026, 11:48 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Vanderbilt Pertussis Exposure Study: PEP in Vaccinated Healthcare Workers Following Pertussis Exposure

NCT00469274
View directory record Official record
Conditions
Pertussis
Interventions
Antibiotic PEP
Drug
Lead sponsor
Vanderbilt University
Other
Eligibility
18 Years to 64 Years
Enrollment
1,102 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2009
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Jan 28, 2013 · Synced Jul 22, 2026, 11:48 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

A Study to Compare the Impact of a School Based HPV Program on Vaccination Uptake and Completion Rates

NCT01526551
View directory record Official record
Conditions
Human Papillomavirus
Interventions
HPV Vaccine and HPV-related Health Education, Reduction of barriers
Other
Lead sponsor
Lake Cumberland District Health Department
Other
Eligibility
12 Years to 20 Years
Enrollment
935 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2013
U.S. locations
2
States / cities
Monticello, Kentucky
Source: ClinicalTrials.gov public record
Updated Mar 5, 2015 · Synced Jul 22, 2026, 11:48 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Impact of LA-CEAL HALT COVID-19 Ambassador Program on Likelihood to Vaccinate

NCT04930965
View directory record Official record
Conditions
Covid19, Vaccine Refusal
Interventions
Community health worker engagement
Behavioral
Lead sponsor
Tulane University
Other
Eligibility
18 Years and older
Enrollment
56 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
1
States / cities
New Orleans, Louisiana
Source: ClinicalTrials.gov public record
Updated Jan 17, 2024 · Synced Jul 22, 2026, 11:48 AM EDT
Active, not recruiting Not applicable Interventional

Impact of Standing Orders Optimization

NCT05742386
View directory record Official record
Conditions
Human Papilloma Virus
Interventions
Communication training, Communication training enhanced with standing orders optimization
Behavioral
Lead sponsor
UNC Lineberger Comprehensive Cancer Center
Other
Eligibility
9 Years to 12 Years
Enrollment
27 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2026
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Apr 20, 2026 · Synced Jul 22, 2026, 11:48 AM EDT
Terminated Not applicable Interventional Accepts healthy volunteers Results available

PET-CT Scans in Healthy Volunteers After Flu Vaccination

NCT00769002
View directory record Official record
Conditions
Flu
Interventions
FluShield, FluShield - same arm, FluShield - opposite arm, Blood Draws, FDG PET-CT Scan, Cytokine Profiling
Biological · Procedure · Genetic
Lead sponsor
Hackensack Meridian Health
Other
Eligibility
21 Years to 55 Years
Enrollment
18 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2011
U.S. locations
1
States / cities
Hackensack, New Jersey
Source: ClinicalTrials.gov public record
Updated Oct 18, 2020 · Synced Jul 22, 2026, 11:48 AM EDT
Active, not recruiting Phase 4 Interventional

Impact of Immunosuppression Adjustment on COVID-19 Vaccination Response in Kidney Transplant Recipients

NCT05060991
View directory record Official record
Conditions
COVID-19, Immunosuppression, Vaccine Response Impaired
Interventions
Reduction in antimetabolite immunosuppression
Drug
Lead sponsor
University of California, Davis
Other
Eligibility
18 Years and older
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2026
U.S. locations
1
States / cities
Sacramento, California
Source: ClinicalTrials.gov public record
Updated Apr 2, 2026 · Synced Jul 22, 2026, 11:48 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Impact of SC vs IM Administration of DENVax (TDV) on Safety and Immunogenicity

NCT01728792
View directory record Official record
Conditions
Dengue Fever
Interventions
TDV
Biological
Lead sponsor
Takeda
Industry
Eligibility
18 Years to 45 Years
Enrollment
80 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013
U.S. locations
1
States / cities
Syracuse, New York
Source: ClinicalTrials.gov public record
Updated Jul 17, 2019 · Synced Jul 22, 2026, 11:48 AM EDT
Completed Phase 2 Interventional Results available

Evaluation of the Impact of Adjuvants Accompanying Peptide Immunization in High-Risk Melanoma

NCT00273910
View directory record Official record
Conditions
High-Risk Melanoma
Interventions
gp100:209-217 (210M), Montanide ISA-51, Imiquimod
Drug
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
7 Years and older
Enrollment
104 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2010
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 18, 2012 · Synced Jul 22, 2026, 11:48 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Video Messages and Vaccination Intention

NCT04979416
View directory record Official record
Conditions
COVID-19 Vaccination
Interventions
Video messages
Behavioral
Lead sponsor
University of Southern California
Other
Eligibility
18 Years and older
Enrollment
1,001 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Dec 9, 2021 · Synced Jul 22, 2026, 11:48 AM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Impact of High Dietary Fiber on Microbiome and Vaccine Responses

NCT05565586
View directory record Official record
Conditions
Influenza
Interventions
High-Fiber Diet (HFD), Prebiotic Food-Enriched Diet (PreFED)
Dietary Supplement
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
18 Years and older
Enrollment
31 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2029
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Mar 3, 2026 · Synced Jul 22, 2026, 11:48 AM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Salud en Mis Manos - Breast and Cervical Cancer Prevention and Early Detection - Expansion 2

NCT06082882
View directory record Official record
Conditions
Breast Cancer, Cervical Cancer
Interventions
Education, Navigation to clinic
Behavioral
Lead sponsor
The University of Texas Health Science Center, Houston
Other
Eligibility
18 Years to 74 Years · Female only
Enrollment
8,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2025
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Dec 11, 2024 · Synced Jul 22, 2026, 11:48 AM EDT
Terminated No phase listed Observational Accepts healthy volunteers

Impact of Vaccination on Th2 Immunity in Infancy

NCT02213341
View directory record Official record
Conditions
Food Hypersensitivity
Interventions
Skin prick allergen test, Blood draw
Procedure
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
5 Months to 7 Months
Enrollment
77 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2016
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jul 22, 2019 · Synced Jul 22, 2026, 11:48 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

COVID Booster in Pregnancy and Lactation

NCT05543993
View directory record Official record
Conditions
COVID-19
Interventions
Bivalent COVID-19 Booster
Drug
Lead sponsor
Thomas Jefferson University
Other
Eligibility
13 Years to 55 Years · Female only
Enrollment
150 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Dec 1, 2025 · Synced Jul 22, 2026, 11:48 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

RSV F Vaccine Maternal Immunization Study in Healthy Third-trimester Pregnant Women.

NCT02247726
View directory record Official record
Conditions
Respiratory Syncytial Virus Infections
Interventions
Saline Placebo (0.5mL injection), RSV F vaccine (0.5mL injection)
Drug
Lead sponsor
Novavax
Industry
Eligibility
18 Years to 40 Years · Female only
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2016
U.S. locations
7
States / cities
Nampa, Idaho • Hutchinson, Kansas • Kansas City, Kansas + 4 more
Source: ClinicalTrials.gov public record
Updated May 26, 2022 · Synced Jul 22, 2026, 11:48 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Oral Water Hydration to Prevent Post-Vaccination Presyncope

NCT02353390
View directory record Official record
Conditions
Presyncope, Syncope
Interventions
Oral Water Hydration
Other
Lead sponsor
Duke University
Other
Eligibility
11 Years to 21 Years
Enrollment
1,820 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2016
U.S. locations
2
States / cities
Boston, Massachusetts • Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Jul 6, 2016 · Synced Jul 22, 2026, 11:48 AM EDT
Completed No phase listed Observational Results available

The Impact of Vaccination on Severity of Illness in COVID-19

NCT04912700
View directory record Official record
Conditions
Covid19
Interventions
COVID-19 vaccine
Biological
Lead sponsor
Corewell Health East
Other
Eligibility
18 Years and older
Enrollment
11,834 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021
U.S. locations
1
States / cities
Royal Oak, Michigan
Source: ClinicalTrials.gov public record
Updated Sep 29, 2021 · Synced Jul 22, 2026, 11:48 AM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Impact of Financial Incentives

NCT05744960
View directory record Official record
Conditions
Human Papilloma Virus
Interventions
Communication training, financial Incentive
Behavioral
Lead sponsor
UNC Lineberger Comprehensive Cancer Center
Other
Eligibility
9 Years to 12 Years
Enrollment
34 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2026
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Jun 4, 2026 · Synced Jul 22, 2026, 11:48 AM EDT