# Investigating a Vaccine Against COVID-19

> **NCT04400838** · PHASE2,PHASE3 · COMPLETED · sponsor: **University of Oxford** · enrollment: 10811 (actual)

## Conditions studied

- Coronavirus

## Interventions

- **BIOLOGICAL:** ChAdOx1 nCoV-19 (Abs 260)
- **BIOLOGICAL:** MenACWY vaccine
- **BIOLOGICAL:** ChAdOx1 nCoV-19 (Abs 260) + 2.2x10^10vp (qPCR) boost
- **BIOLOGICAL:** Two dose MenACWY vaccine
- **BIOLOGICAL:** ChAdOx1 nCoV-19 (qPCR)
- **BIOLOGICAL:** ChAdOx1 nCoV-19 0.5mL prime plus boost
- **BIOLOGICAL:** Two dose MenACWY vaccine min. 4 weeks apart
- **BIOLOGICAL:** Two dose ChAdOx1 nCoV-19/Covishield 0.5mL
- **BIOLOGICAL:** Two dose ChAdOx1 nCoV-19/Covishield 0.25mL & 0.5mL

## Key facts

- **NCT ID:** NCT04400838
- **Lead sponsor:** University of Oxford
- **Sponsor class:** OTHER
- **Phase:** PHASE2,PHASE3
- **Study type:** INTERVENTIONAL
- **Status:** COMPLETED
- **Start date:** 2020-05-28
- **Primary completion:** 2025-02-05
- **Final completion:** 2025-02-05
- **Target enrollment:** 10811 (ACTUAL)
- **Last updated:** 2025-09-03


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT04400838

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT04400838, "Investigating a Vaccine Against COVID-19". Retrieved via AI Analytics 2026-05-26 from https://api.ai-analytics.org/clinical/NCT04400838. Licensed CC0.

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