A Pragmatic Assessment of Influenza Vaccine Effectiveness in the DoD
Public ClinicalTrials.gov record NCT03734237. Field values are reproduced from the official study page; the official ClinicalTrials.gov record remains the source of truth for eligibility, enrollment, and contact information.
Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.
Brief summary
Reproduced verbatim from the official ClinicalTrials.gov record. Not medical advice.
A total of 18,000 eligible subjects (or 6,000 subject distributed evenly between the 3 study arms) will be enrolled. Eligible subjects will be randomized in 1:1:1 (cell-culture-based vaccine, the recombinant vaccine, or the egg-based vaccine) over four influenza seasons (2018-2019, 2019-2020, 2020-2021, and 2021-2022).
Study identification
- NCT ID
- NCT03734237
- Recruitment status
- Active, not recruiting
- Study type
- Interventional
- Phase
- Phase 4
- Enrollment
- 15,448 participants
Conditions and interventions
Conditions
Interventions
- Egg based influenza vaccines Biological
- Recombinant influenza vaccines Biological
- Cell-culture based influenza vaccines Biological
Biological
Eligibility (public fields only)
- Age range
- 18 Years and older
- Sex
- All
- Healthy volunteers
- Accepts healthy volunteers
This page does not interpret eligibility. Detailed inclusion and exclusion criteria are on the official ClinicalTrials.gov record.
Study timeline
- Start date
- Nov 6, 2018 (Actual)
- Primary completion
- Jul 7, 2022 (Actual)
- Completion
- Jun 30, 2026 (Estimated)
- Last update posted
- Apr 2, 2026
2018 – 2026
United States locations
- U.S. sites
- 9
- U.S. states
- 6
- U.S. cities
- 8
| Facility | City | State | ZIP | Site status |
|---|---|---|---|---|
| Naval Medical Center San Diego | San Diego | California | 34800 | — |
| United States Naval Academy | Annapolis | Maryland | 21402 | — |
| USU | Bethesda | Maryland | 20307 | — |
| Walter Reed National Military Medical Center | Bethesda | Maryland | 20814 | — |
| Womack Army Medical Center | Fort Bragg | North Carolina | 28310 | — |
| Brooke Army Medical Center | Fort Sam Houston | Texas | 78234 | — |
| Lackland Airforce Base | San Antonio | Texas | 78243 | — |
| Naval Medical Center Portsmouth | Portsmouth | Virginia | 23704 | — |
| Madigan Army Medical Center | Tacoma | Washington | 98431 | — |
Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.
About this trial record page
- What this page shows
- Public field values for ClinicalTrials.gov record NCT03734237, including study identification, conditions, interventions, eligibility (age, sex, healthy volunteer), timeline, and U.S. site list.
- What this page does not do
- No medical advice, eligibility judgments, treatment recommendations, study quality scoring, or AI-generated medical summaries. No site contact phone numbers, emails, or investigator names.
- Where the data comes from
- Sourced from the official ClinicalTrials.gov public API. The official record is the source of truth.
- Last refresh
- Last update posted Apr 2, 2026 · Synced Oct 21, 2026
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Open the official record
The complete public registry record, listed eligibility criteria, and available contact information for NCT03734237 live on ClinicalTrials.gov.