Vaccine Study for Tick-Borne Encephalitis Virus (TBEV) (NCT01031537) | Clinical Trial Compass
TerminatedPhase 2
Vaccine Study for Tick-Borne Encephalitis Virus (TBEV)
Stopped: Manufacturer discontinued support of the study
United States69 participantsStarted 2009-09-25
Plain-language summary
This was an open label trial of a non-US licensed vaccine for tick-borne encephalitis. The vaccine was licensed by Baxter, and now following an acquisition by Pfizer Inc in Vienna, Austria since 2001, and has an extensive safety record in multiple European countries. Field effectiveness studies suggest \> 99 percent protection against disease transmitted by the natural routes of either tick bite or ingestion of contaminated, unpasteurized milk. The vaccine is also considered to be effective against laboratory exposures and is used routinely for this purpose in European laboratories. The US Centers for Disease Control and Prevention and the National Institutes of Health acknowledge the effectiveness of the vaccine by allowing those who have received it to study tick-borne encephalitis virus (TBEV) in isolation facilities rated at BSL-3 rather than the more stringent BSL-4, with the exception of the Russian Spring-Summer Encephalitis strain. Subjects were recruited from personnel at 2 intramural campuses of the National Institute of Allergy and Infectious Diseases who may be exposed accidentally to any strain or serotype of viable TBEV. Approximately 160 individuals were eligible to participate. The rapid immunization schedule (injections on Days 0, 14, and 161) was used and subjects had labs drawn 21 days after the 2nd, 3rd and 4th vaccine injections to determine seroconversion. Subjects that seroconverted to TBEV were offered a booster dose of the vaccine 3 years from the date of receipt of the third dose of the vaccine. Subjects that were seropositive at entry into the study were offered a booster dose of the vaccine every 3 years from Day 0.
Who can participate
Age range
18 Years – 100 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:
All subjects must meet the following criteria at study entry:
* Be engaged in activities that place them at potential risk of occupational exposure to TBEV in its viable form at one of the participating intramural laboratories of NIAID
* Be 18 years of age or older at the time of the first immunization.
* Comprehend the study requirements.
* Provide written informed consent to participate in this study.
* Be in good health as determined by the Investigator, based upon medical history and a targeted physical examination.
* Have a stable health status as determined by the Investigator.
* Have access to a consistent means of telephone contact, which may be either in the home or at the workplace, land line or mobile, but NOT a pay phone or other multiple-user device (i.e., a common use phone serving multiple rooms or apartments).
* Express availability for the required study period, and ability to attend scheduled visits.
EXCLUSION CRITERIA:
The following criteria should be checked at the time of the study entry. If any apply, the subject will not be included in the study:
* The subject must not be participating in any other trial of an investigational drug or vaccine for 1 month prior to the first injection through until 21 days after the third injection. (Given the nature of the work these study subjects engage in, exemptions to this proscription may be granted on a case by case basis after discussion between the Investigator and the IRB.)
* The prese…
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
TBEV Viral Neutralization Titer >1:10
Timeframe: Baseline
2
TBEV Viral Neutralization Titer >1:10
Timeframe: 6 months
Trial details
NCT IDNCT01031537
SponsorNational Institute of Allergy and Infectious Diseases (NIAID)