Characterization of Human Memory Immune Responses to Prior Yellow Fever Vaccination
For patients and families
In plain language
An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.
- What is being studied
- This is an observational study: the protocol does not assign a study treatment.
- Who it may be relevant to
- Registry conditions: Yellow Fever Vaccine. Basic parameters: from 18 years · All.
- What needs checking
- Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
- Where it takes place
- United States
- Next step
- Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →
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Overview
The objective of this study is to study immune memory generated against the yellow fever (YFV) vaccine in participants who have previously received the vaccine. Volunteers will not receive vaccine shots; only immune responses to previous yellow fever vaccination will be studied. The study involves one or multiple blood draws.
Detailed description
The goal of this study is to characterize immune memory in humans who have previously received yellow fever vaccine. The project is designed to study the magnitude and persistence of both humoral, and cell-mediated immune memory generated post-vaccination. Since aging has an effect on the immune system (eg. decreased thymic output, replacement of hematopoietic cells in the bone marrow with adipocytes), the researchers will analyze the young adults (aged 18-45 years) and the older vaccinees (55 years or older) in separate groups.
The specific aims of the study are to:
* Determine the phenotypic and functional characterization of memory T cell responses to yellow fever vaccination * Determine neutralizing antibody titer after yellow fever vaccination
Primary outcome measures
- Determine the phenotypic and functional characterization of memory T cell responses to YF vaccination [Time frame: Immune responses will be measured from at least 30 days after yellow fever vaccination.]
Eligibility criteria
Inclusion criteria
- Able to understand and give informed consent
- Age 18-45 years (Group 1) or 55 years and above (Group 2) at the time of yellow fever vaccination
- Documentation (international certificate of vaccination (yellow card) or medical record) indicating receipt of yellow fever vaccine.
Exclusion criteria
- Recipient of any vaccines within 30 days before the study visit (not applicable to older adults)
- History of a progressive and severe chronic medical condition resulting in impaired immunity (such as diabetes, kidney or liver dysfunction)
- Required use of immunosuppressive medications
- Reporting HIV, Hepatitis B (surface antigen positive) or Hepatitis C infections (antibody positive) on the medical/health history form
- Recipient of a blood product or immune globulin product within 42 days of study visit
- Reporting pregnancy
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: Yes
Study design
- Observational model
- Other
Study locations
United States · 1 center
- The Hope clinic of Emory Vaccine Center — Decatur
Identifiers
NCT: NCT01244802 · IRB00002834 · U19AI057266