# A Study of an Investigational mRNA-1273.815 COVID-19 Vaccine in Previously Vaccinated Adults

> **NCT06354998** · PHASE3 · COMPLETED · sponsor: **ModernaTX, Inc.** · enrollment: 217 (actual)

## Conditions studied

- SARS-CoV-2

## Interventions

- **BIOLOGICAL:** Investigational mRNA-1273.815
- **BIOLOGICAL:** Licensed Spikevax Vaccine

## Key facts

- **NCT ID:** NCT06354998
- **Lead sponsor:** ModernaTX, Inc.
- **Sponsor class:** INDUSTRY
- **Phase:** PHASE3
- **Study type:** INTERVENTIONAL
- **Status:** COMPLETED
- **Start date:** 2024-04-08
- **Primary completion:** 2024-05-10
- **Final completion:** 2024-05-10
- **Target enrollment:** 217 (ACTUAL)
- **Last updated:** 2025-05-25


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT06354998

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT06354998, "A Study of an Investigational mRNA-1273.815 COVID-19 Vaccine in Previously Vaccinated Adults". Retrieved via AI Analytics 2026-07-08 from https://api.ai-analytics.org/clinical/NCT06354998. Licensed CC0.

---

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