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

> **NCT05634811** · PHASE3 · COMPLETED · sponsor: **Pfizer** · enrollment: 3547 (actual)

## Conditions studied

- Lyme Disease

## Interventions

- **BIOLOGICAL:** VLA15
- **OTHER:** Normal Saline

## Key facts

- **NCT ID:** NCT05634811
- **Lead sponsor:** Pfizer
- **Sponsor class:** INDUSTRY
- **Phase:** PHASE3
- **Study type:** INTERVENTIONAL
- **Status:** COMPLETED
- **Start date:** 2022-12-12
- **Primary completion:** 2025-07-21
- **Final completion:** 2025-07-21
- **Target enrollment:** 3547 (ACTUAL)
- **Last updated:** 2026-05-07


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT05634811

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT05634811, "Safety Study of a Vaccine to Help Protect Against Lyme Disease in Healthy Children". Retrieved via AI Analytics 2026-08-03 from https://api.ai-analytics.org/clinical/NCT05634811. Licensed CC0.

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