# An Immunity Persistence Study of Sabin Inactivated Poliovirus Vaccine(Vero Cell) After Four Doses

> **NCT04989231** · — · COMPLETED · sponsor: **Sinovac Biotech Co., Ltd** · enrollment: 450 (actual)

## Conditions studied

- Poliomyelitis

## Interventions

- **BIOLOGICAL:** Investigational sIPV
- **BIOLOGICAL:** Control IPV

## Key facts

- **NCT ID:** NCT04989231
- **Lead sponsor:** Sinovac Biotech Co., Ltd
- **Sponsor class:** INDUSTRY
- **Phase:** —
- **Study type:** OBSERVATIONAL
- **Status:** COMPLETED
- **Start date:** 2021-09-09
- **Primary completion:** 2022-12-25
- **Final completion:** 2022-12-25
- **Target enrollment:** 450 (ACTUAL)
- **Last updated:** 2023-01-12


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT04989231

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT04989231, "An Immunity Persistence Study of Sabin Inactivated Poliovirus Vaccine(Vero Cell) After Four Doses". Retrieved via AI Analytics 2026-06-03 from https://api.ai-analytics.org/clinical/NCT04989231. Licensed CC0.

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