# Study Comparing a 13-valent Pneumococcal Conjugate Vaccine With 23-valent Pneumococcal Polysaccharide Vaccine in Adults

> **NCT00427895** · PHASE3 · COMPLETED · sponsor: **Pfizer** · enrollment: 2141 (actual)

## Conditions studied

- Pneumococcal Infections

## Interventions

- **BIOLOGICAL:** 13-valent pneumococcal conjugate vaccine (13vPnC)
- **BIOLOGICAL:** 23-valent Pneumococcal Polysaccharide Vaccine (23vPS)
- **BIOLOGICAL:** 13-valent pneumococcal conjugate vaccine (13vPnC)
- **BIOLOGICAL:** 13-valent pneumococcal conjugate vaccine (13vPnC)
- **BIOLOGICAL:** 13-valent pneumococcal conjugate vaccine (13vPnC)
- **BIOLOGICAL:** 23-valent Pneumococcal Polysaccharide Vaccine (23vPS)
- **BIOLOGICAL:** 13-valent pneumococcal conjugate vaccine (13vPnC)

## Key facts

- **NCT ID:** NCT00427895
- **Lead sponsor:** Pfizer
- **Sponsor class:** INDUSTRY
- **Phase:** PHASE3
- **Study type:** INTERVENTIONAL
- **Status:** COMPLETED
- **Start date:** 2007-02-27
- **Primary completion:** 2011-08-01
- **Final completion:** 2011-08-01
- **Target enrollment:** 2141 (ACTUAL)
- **Last updated:** 2021-11-15


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT00427895

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT00427895, "Study Comparing a 13-valent Pneumococcal Conjugate Vaccine With 23-valent Pneumococcal Polysaccharide Vaccine in Adults". Retrieved via AI Analytics 2026-06-03 from https://api.ai-analytics.org/clinical/NCT00427895. Licensed CC0.

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