CI

At a glance

ClinicalIndex Comparison Record
Phase 4Completed· 88 enrolled
Drug / intervention
Yellow Fever Vaccinebiological
Likely dose
Not stated in record
Structured eligibility isn't available for this trial yet — see the full criteria in the Eligibility tab below.

Standardized by ClinicalIndex from the ClinicalTrials.gov record · verify against the source.

Search/NCT05374317
NCT05374317Phase 4Completed

An Exploratory, Pilot Study of the Safety and Immunogenicity of Reduced Doses of the US Yellow Fever Vaccine

US Army Medical Research Institute of Infectious Diseases·interventional·Posted May 16, 2022·Updated Apr 7, 2026

In Brief

A Phase 4 clinical trial evaluating Yellow Fever Vaccine for Yellow Fever Vaccination Reaction. Completed, enrolled 88 participants across 1 site.

Detailed Summary

This is an open-label, randomized, exploratory study to evaluate the human immune response to reduced subcutaneous (SQ) dosing of Yellow Fever vaccine compared to the standard FDA approved subcutaneous vaccination dose. The current dose of the US FDA licensed Yellow Fever vaccine is approximately 55,000 plaque-forming unit(s) (PFU) in 0.5 mL administered SQ. Using the licensed dosage as standard, investigators are evaluating reduced doses of 1/5th (0.10 mL) and 1/10th (0.05 mL) standard Yellow Fever vaccine (YF-VAX).

Study Details

Study Typeinterventional
Allocation--
Masking--
Primary Purpose--
CountriesUnited States
Collaborators--

Timeline

Phase 4CompletedFinished
20222023202420252026
First PostedMay 16, 2022
Enrollment StartJun 7, 2021
Primary CompletionNov 2, 2022
TodayJul 2, 2026
Enrollment to primary: 1.4 yearsPosted 4.1 years ago

Interventions

Yellow Fever Vaccinebiological

Administered subcutaneously once.