Safety and Immunogenicity Study of Tdap Vaccinations for Plasma Donors (NCT05662852) | Clinical Trial Compass
CompletedPhase 2
Safety and Immunogenicity Study of Tdap Vaccinations for Plasma Donors
United States100 participantsStarted 2023-05-05
Plain-language summary
The goal of this clinical trial is to investigate the safety and tetanus antibody response to a Tdap vaccine in healthy plasma donors. The main question it aims to answer are:
* Is it safe to give this vaccine multiple times over one year to plasma donors since the package insert for this vaccine indicates that it should administered once every 10 years?
* What is the tetanus antibody response over time in these donors after receiving the vaccine multiple times during the study?
Participants will receive a Tdap vaccination every 3 months ±2 weeks for 12 months (5 vaccinations) with a 6 month follow-up after the last vaccination. After obtaining informed consent and screening for eligibility including plasmapheresis donor eligibility, subjects will have other baseline assessments performed and if eligible, will receive the scheduled vaccinations, will be assessed for adverse events (AEs) and have plasma samples collected for antibody titers each month thereafter for 11 months, and then at 1 and 6 months after the last vaccination. As these subjects are participating in a standard donor plasmapheresis donor program, assessments for donor eligibility and routine plasmapheresis will be performed; however, only the data specifically required to meet the objectives of this study will be collected.
Who can participate
Age range
18 Years – 63 Years
Sex
ALL
See this in plain English?
AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Inclusion Criteria:
* Male or female ages 18 to 63 years
* Females of childbearing potential who agree to employ highly effective birth control measures during the study
* Signed the informed consent form (ICF)
* Met all of the criteria required to be a Normal Source Plasma donor
* Subject is not participating in any other immunization program
* Subject has not had a Tdap vaccination in the last 90 days before the first study vaccination
Exclusion Criteria:
* Subject is pregnant
* Subject has a condition or abnormality that in the opinion of the Investigator would compromise the safety of the subject or the quality of the data
* Subject has repeated reactions or hypersensitivity to components in the vaccine
* Subject has history of a severe reaction to any immunization
* Subject has a history of Guillain-Barré Syndrome
* The Investigator concludes that the anticipated vaccination site (deltoid area) is not suitable for AE assessment
Questions worth asking your doctor
Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.
1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?
Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.
Questions for the trial coordinator
The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.
1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?
A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.
What they're measuring
1
Number of Participants With Treatment Emergent Adverse Events (TEAEs)