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Completed Phase 3 Interventional Accepts healthy volunteers Results available

Safety Study of a Vaccine to Help Protect Against Lyme Disease in Healthy Children

ClinicalTrials.gov ID: NCT05634811

Public ClinicalTrials.gov record NCT05634811. Field values are reproduced from the official study page; the official ClinicalTrials.gov record remains the source of truth for eligibility, enrollment, and contact information.

ClinicalTrials.gov public records Last synced Nov 4, 2026, 5:20 AM EST

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Official title

A PHASE 3, RANDOMIZED, PLACEBO-CONTROLLED, OBSERVER-BLINDED TRIAL TO EVALUATE THE SAFETY OF A 6-VALENT OspA-BASED LYME DISEASE VACCINE (VLA15) IN HEALTHY CHILDREN 5 THROUGH 17 YEARS OF AGE

Brief summary

Reproduced verbatim from the official ClinicalTrials.gov record. Not medical advice.

This study is to understand if the study vaccine (called VLA15) is safe in healthy children. We are looking for children who: * are healthy * are age 5 through 17 * have not been diagnosed with any form of Lyme disease in the past * have not received any vaccines for Lyme disease in the past Lyme disease happens most often in children of this age. The study vaccine may be used potentially to help prevent Lyme disease. The goal of this study is to get more information about the safety of the study vaccine in this age group. Participants will be in this study for about 2 years. During that time, they will receive VLA15 or placebo (sterile saltwater solution) by a "shot" in the arm. We will compare experience of children receiving VLA15 to those receiving the placebo. Participants will not know whether they get VLA15 or placebo. Everyone participating in this study will: * get the shots in a clinic or in a hospital office * receive a total of 4 shots * receive the first 3 shots within 6 months * receive the last shot about 1 year afterwards * need to come to the trial site for 6 planned visits; 4 of these are vaccination visits and 2 are follow-up visits. We will contact you by phone 1 time every year during the study to monitor your experience. You may have extra visits if you experience a severe reaction after a vaccine dose.

Study identification

NCT ID
NCT05634811
Recruitment status
Completed
Study type
Interventional
Phase
Phase 3
Lead sponsor
Pfizer
Industry
Enrollment
3,547 participants

Conditions and interventions

Conditions

Interventions

Biological · Other

Eligibility (public fields only)

Age range
5 Years to 17 Years
Sex
All
Healthy volunteers
Accepts healthy volunteers

This page does not interpret eligibility. Detailed inclusion and exclusion criteria are on the official ClinicalTrials.gov record.

Study timeline

Start date
Dec 12, 2022 (Actual)
Primary completion
Jul 21, 2025 (Actual)
Completion
Jul 21, 2025 (Actual)
Last update posted
May 7, 2026

2022 – 2025

United States locations

U.S. sites
65
U.S. states
24
U.S. cities
58
Facility City State ZIP Site status
UAB Child Health Research Unit (CHRU) Birmingham Alabama 35233 —
University of Alabama at Birmingham - School of Medicine Birmingham Alabama 35233 —
Lakeview Clinical Research Guntersville Alabama 35976 —
Coast Clinical Research, LLC Bellflower California 90706 —
Apex Research Group LLC Fair Oaks California 95628 —
New England Research Associates Bridgeport Connecticut 06606 —
Stamford Therapeutics Consortium Stamford Connecticut 06905 —
Children's National Medical Center Washington D.C. District of Columbia 20010 —
Bio-Medical Research LLC Miami Florida 33144 —
GCP Research, Global Clinical professionals St. Petersburg Florida 33705 —
MOORE Clinical Research, Inc. d/b/a TrueBlue Clinical Research Tampa Florida 33609 —
ForCare Clinical Research Tampa Florida 33613 —
Tekton Research, LLC. Chamblee Georgia 30341 —
ASR, LLC Boise Idaho 83702 —
Clinical Research Prime Idaho Falls Idaho 83404 —
Clinical Research Prime Rexburg Rexburg Idaho 83440 —
University of Chicago Medical Center Chicago Illinois 60637 —
AMR Clinical El Dorado Kansas 67042 —
AMR Clinical Wichita Kansas 67207 —
Kentucky Pediatric/ Adult Research Bardstown Kentucky 40004 —
All Children Pediatrics Louisville Kentucky 40243 —
MD Medical Research Oxon Hill Maryland 20745 —
White Oak Pediatrics Silver Spring Maryland 20904 —
Sisu BHR Springfield Massachusetts 01103 —
Michigan Center of Medical Research (MICHMER) Bingham Farms Michigan 48025 —
Vida Clinical Studies, LLC Dearborn Heights Michigan 48127 —
Great Lakes Research Institute Southfield Michigan 48075 —
Clinical Research Institute Minneapolis Minnesota 55402 —
Velocity Clinical Research, Omaha Omaha Nebraska 68134 —
Hassman Research Institute Marlton New Jersey 08053 —
Rutgers University New Brunswick New Jersey 08901 —
IMA Clinical Research Warren Warren Township New Jersey 07059 —
Velocity Clinical Research, Binghamton Binghamton New York 13905 —
Buffalo Clinical and Translational Research Center Buffalo New York 14203 —
Advanced Specialty Care Commack New York 11725 —
Smith Allergy and Asthma Specialists Cortland New York 13045 —
Stony Brook Medicine Clinical Research Center East Setauket New York 11733 —
Upstate Global Health Institute East Syracuse New York 13057 —
Southampton Hospital Hampton Bays New York 11946 —
Smith Allergy & Asthma Specialists Horseheads New York 14845 —
NYU Langone Hospital - Long Island Mineola New York 11501 —
DiGiovanna Institute for Medical Education & Research North Massapequa New York 11758 —
Rochester Clinical Research, LLC Rochester New York 14609 —
Stony Brook University Stony Brook New York 11794 —
Prime Global Research The Bronx New York 10456 —
Advantage Clinical Trials The Bronx New York 10467 —
Velocity Clinical Research, Vestal Vestal New York 13850 —
Centricity Research Columbus Ohio Multispecialty Columbus Ohio 43213 —
Allegheny Health and Wellness Pavilion Erie Pennsylvania 16506 —
Central Erie Primary Care Erie Pennsylvania 16508 —
Preferred Primary Care Physicians, Preferred Clinical Research (Ofc 18) Pittsburgh Pennsylvania 15236 —
Northeast Clinical Trials Group Scranton Pennsylvania 18510 —
Coastal Carolina Research Center North Charleston South Carolina 29405 —
Benchmark Research Austin Texas 78705 —
Benchmark Research Fort Worth Texas 76135 —
Texas Health Resources Fort Worth Texas 76135 —
C & R Research Services USA Houston Texas 77022 —
DM Clinical Research - Kool Kids Pediatrics Houston Texas 77065 —
Research Your Health Plano Texas 75093 —
Sun Research Institute San Antonio Texas 78215 —
Velocity Clinical Research, Salt Lake City West Jordan Utah 84088 —
Pediatric Research of Charlottesville, LLC Charlottesville Virginia 22902 —
Clinical Research Partners, LLC Richmond Virginia 23226 —
Frontier Clinical research Kingwood West Virginia 26537 —
Preston Healthcare Services Kingwood West Virginia 26537 —

Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.

About this trial record page

What this page shows
Public field values for ClinicalTrials.gov record NCT05634811, including study identification, conditions, interventions, eligibility (age, sex, healthy volunteer), timeline, and U.S. site list.
What this page does not do
No medical advice, eligibility judgments, treatment recommendations, study quality scoring, or AI-generated medical summaries. No site contact phone numbers, emails, or investigator names.
Where the data comes from
Sourced from the official ClinicalTrials.gov public API. The official record is the source of truth.
Last refresh
Last update posted May 7, 2026 · Synced Nov 4, 2026

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Open the official record

The complete public registry record, listed eligibility criteria, and available contact information for NCT05634811 live on ClinicalTrials.gov.

View official ClinicalTrials.gov record →