# A Study of Zika Vaccine mRNA-1893 in Adult Participants Living in Endemic and Non-Endemic Flavivirus Areas

> **NCT04917861** · PHASE2 · COMPLETED · sponsor: **ModernaTX, Inc.** · enrollment: 808 (actual)

## Conditions studied

- Zika Virus

## Interventions

- **BIOLOGICAL:** mRNA-1893
- **BIOLOGICAL:** Placebo

## Key facts

- **NCT ID:** NCT04917861
- **Lead sponsor:** ModernaTX, Inc.
- **Sponsor class:** INDUSTRY
- **Phase:** PHASE2
- **Study type:** INTERVENTIONAL
- **Status:** COMPLETED
- **Start date:** 2021-06-07
- **Primary completion:** 2024-07-26
- **Final completion:** 2024-07-26
- **Target enrollment:** 808 (ACTUAL)
- **Last updated:** 2025-09-25


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT04917861

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT04917861, "A Study of Zika Vaccine mRNA-1893 in Adult Participants Living in Endemic and Non-Endemic Flavivirus Areas". Retrieved via AI Analytics 2026-07-26 from https://api.ai-analytics.org/clinical/NCT04917861. Licensed CC0.

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