Testing a yellow fever vaccine in healthy adults

Yellow Fever Human Infection Model With YF-17D

NA · Leiden University Medical Center · NCT05901454

This study is testing a yellow fever vaccine in healthy adults aged 18-50 to see if it is safe and effective for people who are at risk but can't get vaccinated.

Quick facts

PhaseNA
Study typeInterventional
Enrollment30 (estimated)
Ages18 Years to 50 Years
SexAll
SponsorLeiden University Medical Center (other)
Locations1 site (Leiden)
Trial IDNCT05901454 on ClinicalTrials.gov

What this trial studies

This study investigates the safety and efficacy of the YF-17D yellow fever vaccine in healthy adults aged 18-50 years. It aims to address the lack of antiviral treatments for yellow fever, focusing on individuals who are at risk but cannot be vaccinated due to contraindications. The study will involve administering the vaccine and monitoring participants for any adverse effects or immune responses. The ultimate goal is to develop effective treatment options for those unprotected against yellow fever infection.

Who should consider this trial

Good fit: Ideal candidates for this study are healthy adults aged 18-50 years who are at risk of yellow fever infection.

Not a fit: Patients with contraindications to the YF-17D vaccine, such as immune deficiencies or previous vaccinations, will not benefit from this study.

Why it matters

Potential benefit: If successful, this study could lead to life-saving treatment options for individuals at risk of yellow fever who cannot be vaccinated.

How similar studies have performed: Other studies have explored yellow fever vaccination and its effects, but this specific approach to treatment in unvaccinated individuals is relatively novel.

Eligibility criteria

Show full inclusion / exclusion criteria
Inclusion Criteria:

* age 18-50 years

Exclusion Criteria:

* contraindication to receive YF-17D (immune deficiency, thymus illness)
* previous YF vaccination
* pregnancy
* chicken egg allergy
* hypersensitivity to any other substance in the YF-17D vaccine
* interval of \< 4 weeks of another live attenuated vaccine

Where this trial is running

Leiden

Study contacts

How to participate

  1. Review the eligibility criteria above with your treating physician.
  2. Visit the official trial page on ClinicalTrials.gov for the most current contact information and recruitment status.
  3. Contact the listed study coordinator or principal investigator to request pre-screening. Pre-screening is free and never obligates you to enroll.

View on ClinicalTrials.gov →

Conditions: Yellow Fever

Last reviewed 2026-05-15 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.