# TBE Antibody Persistence and Booster Vaccination Study in Adults (Follow-up to Study 223)

> **NCT00503529** · PHASE4 · COMPLETED · sponsor: **Pfizer** · enrollment: 314 (actual)

## Conditions studied

- Encephalitis, Tick-Borne

## Interventions

- **BIOLOGICAL:** Tick-Borne Encephalitis (TBE) Vaccine (Inactivated)

## Key facts

- **NCT ID:** NCT00503529
- **Lead sponsor:** Pfizer
- **Sponsor class:** INDUSTRY
- **Phase:** PHASE4
- **Study type:** INTERVENTIONAL
- **Status:** COMPLETED
- **Start date:** 2007-07
- **Primary completion:** 2010-07
- **Final completion:** 2010-09
- **Target enrollment:** 314 (ACTUAL)
- **Last updated:** 2015-05-21


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT00503529

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT00503529, "TBE Antibody Persistence and Booster Vaccination Study in Adults (Follow-up to Study 223)". Retrieved via AI Analytics 2026-06-25 from https://api.ai-analytics.org/clinical/NCT00503529. Licensed CC0.

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