NCT04269265

The Effect of Inflammation and Damage to Lymph Node Structures on Durable Protective Immunity Following Yellow Fever Vaccination

• Status: Completed
• Phase: Phase 1 / Phase 2
• Study type: Interventional
• Enrollment: 43 (actual)
• Sponsor: University of Minnesota · Academic / Other
• Sex: All
• Age: 18 Years – 60 Years
• Healthy volunteers: Accepted

Summary

Hypothesis: Infections other than HIV can cause LN inflammation and collagen damage to the fibroblastic reticular cell network (FRCn), which will lead to CD4 T cell depletion and impaired vaccine responses. This protocol will study yellow fever vaccine (YFV) in two cohorts of people, one from Uganda and the other from Minnesota where we collect lymphoid tissues (LT) and peripheral blood monocytes (PBMCs) before and after vaccination using a new technique to catalog infectious burden of the individual, determine the relationship between IA, Infections, and immune response.

Detailed description

The primary aim of this study is to determine the difference between antibody titers in the two study groups and study the relationship between endemic infections, IA, the FRCn, and CD4 and CD8 T cell subsets and the magnitude and durability of neutralizing antibody response to YFV in a cohort shown to have elevated IA, a damaged FRCn, and pan T cell depletion and a cohort that does not. This is a single arm, open-label, two cohort study of healthy adults in Kampala, Uganda and in Minnesota, USA. The cohort in Uganda will be 30 adults (15 men and 15 women) and the cohort in Minnesota will be 16 adults (8 men and 8 women). Everyone will be screened to ensure there are no contraindications to receiving YFV (e.g., immunosuppression) or the planned procedures. The inclusion and exclusion criteria are discussed in detail in the protocol that is included in the appendix. Participants will have an inguinal lymph node and adjacent adipose tissue biopsy and leukapheresis prior to YFV and again 3 weeks after the vaccine administration. The vaccine will be given in the contralateral thigh from the first LN biopsy so that the second biopsy will be from a draining LN. PBMC and plasma as well as urine and stool will be collected at regular intervals over the 18-month follow-up period and leukapheresis will be done again at the month 18 visit.

Conditions

• Yellow Fever

Interventions

Type	Name	Description
BIOLOGICAL	Yellow Fever Vaccine	YF-VAX®, Yellow Fever Vaccine, for subcutaneous use

Timeline

• Start date: 2020-07-01
• Primary completion: 2023-10-23
• Completion: 2023-10-23
• First posted: 2020-02-13
• Last updated: 2025-10-07
• Results posted: 2025-10-07

Locations

2 sites across 2 countries: United States, Uganda

Regulatory

• FDA-regulated drug study