# Effectiveness of a Second COVID-19 Vaccine Booster in Chinese Adults

> **NCT05855408** · PHASE4 · UNKNOWN · sponsor: **Jiangsu Province Centers for Disease Control and Prevention** · enrollment: 10000 (estimated)

## Conditions studied

- COVID-19

## Interventions

- **BIOLOGICAL:** Intramuscularly administered Ad5-nCoV vaccine
- **BIOLOGICAL:** Aerosolized Ad5-nCoV
- **BIOLOGICAL:** DelNS1-2019-nCoV-RBD-OPT1
- **BIOLOGICAL:** SYS6006

## Key facts

- **NCT ID:** NCT05855408
- **Lead sponsor:** Jiangsu Province Centers for Disease Control and Prevention
- **Sponsor class:** NETWORK
- **Phase:** PHASE4
- **Study type:** INTERVENTIONAL
- **Status:** UNKNOWN
- **Start date:** 2023-05-18
- **Primary completion:** 2024-05-18
- **Final completion:** 2024-12-31
- **Target enrollment:** 10000 (ESTIMATED)
- **Last updated:** 2023-05-22


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT05855408

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT05855408, "Effectiveness of a Second COVID-19 Vaccine Booster in Chinese Adults". Retrieved via AI Analytics 2026-05-28 from https://api.ai-analytics.org/clinical/NCT05855408. Licensed CC0.

---

*[Clinical trials dataset](/datasets/clinical-trials) · CC0 1.0*