Vaccine Study for Tick-Borne Encephalitis Virus (TBEV)
- Conditions
- Tick-Borne EncephalitisEncephalitis, Tick-BorneTick-Borne DiseaseGlycoprotein E, FlavivirusNSI Protein, Flavivirus
- Interventions
- Biological: FSME-IMMUN 0.5ml Baxter
- Registration Number
- NCT01031537
- Brief 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.
- Detailed Description
Infection by tick-borne encephalitis virus (TBEV) is a significant health concern for humans in Europe and Asia. A vaccine is available in these regions and in Canada, but not in the United States. Research studies in Europe have shown the vaccine to be effective in preventing infection among the general population, where disease is transmitted either by the bite of an infected tick (most common) or by ingestion of contaminated unpasteurized milk or milk products. Persons who work with the virus in a research setting, however, have the potential of being exposed in unnatural ways, and may come into contact with concentrations of virus higher than those found naturally in ticks. The Food and Drug Administration is investigating the effectiveness of the existing vaccine. It is a killed vaccine, which means that it has been treated to ensure that it does not contain live agents (bacteria or virus). The manufacturer has tested the product for other possible contaminating agents and none have been detected. However, there is an unknown but small risk of exposure to undetected contaminating agents in the vaccine. This was an open label trial of a non-US licensed vaccine for tick-borne encephalitis. The vaccine has been 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.
Objectives: To test the safety and immune response to a vaccine against tick-borne encephalitis virus (TBEV). To add a level of protection to persons who may have occupational exposure to TBEV to reduce their chances of developing infection from that exposure.
Eligibility: Individuals 18 years of age or older who are in generally good health and have the potential for occupational exposure to TBEV at one of the two National Institute of Allergy and Infectious Diseases campuses.
Design: The full series of the vaccine included at least three doses by injection in the upper arm. The first and third dose of study vaccine were given in the muscle of the nondominant arm. The second dose was given in the dominant arm. Participation included at least 12 scheduled visits to the study center over approximately 3.5 years. An initial visit took place 7 to 21 days prior to the first injection. Blood samples were taken to test liver and kidney function, baseline antibody levels, and for possible pregnancy in female participants. Vaccine doses were given on days 0, 14, and 161. Participants were asked to complete a diary card on each day for one week following the vaccination to assess any reactions or side effects. At each visit after receipt of a vaccine, participants were asked about any side effects. Blood was drawn 14 days after the second injection and 21 days after the third injection in order to measure the level of antibodies and overall response to the vaccine. Subjects that developed a sufficiently high level of antibodies may (at the discretion of the laboratory chief) be allowed to work with strains of TBEV at Biosafety Level (BSL) 3 rather than BSL-4. Blood was drawn annually for 3 years to determine antibody level and response to the vaccine. Booster doses were provided if required.
Recruitment & Eligibility
- Status
- TERMINATED
- Sex
- All
- Target Recruitment
- 69
Not provided
Not provided
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- SINGLE_GROUP
- Arm && Interventions
Group Intervention Description FSME-IMMUN 0.5mL Baxter FSME-IMMUN 0.5ml Baxter FSME-IMMUN 0.5mL Baxter is non-US licensed vaccine for tick-borne encephalitis virus. The FSME-IMMUN 0.5mL Baxter is available as 0.5mL in a pre-loaded vaccine syringe. All participants received active vaccine using a rapid immunization schedule, with vaccine administration on Days 0, 14, 161 and 245. Participants that tested seropositive for tick-borne encephalitis virus or subjects that developed positive viral neutralizer titers after the 3rd or 4th vaccine were given a booster of FSME-IMMUN 0.5mL Baxter vaccine at 3, 6 and 9 years after enrollment.
- Primary Outcome Measures
Name Time Method TBEV Viral Neutralization Titer >1:10 6 months The number of participants that develop anti-tick borne encephalitis antibody viral neutralization titer levels (\>1:10) following receipt of 3 doses of intramuscular FSME-IMMUN (vaccine series)
- Secondary Outcome Measures
Name Time Method
Trial Locations
- Locations (2)
Rocky Mountain Laboratory (RML)
🇺🇸Hamilton, Montana, United States
National Institutes of Health Clinical Center, 9000 Rockville Pike
🇺🇸Bethesda, Maryland, United States