6-year Antibody Check After Third Vaccination Against Japanese Encephalitis

February 20, 2015 updated by: Herwig Kollaritsch, Medical University of Vienna

Neutralizing Antibody Titers 6 Years After the Third Dose of Inactivated Japanese Encephalitis Vaccine and Projected Duration of Protection

The purpose of this study is to determine whether there are persisting antibodies against Japanese Encephalitis 6 years after the last vaccination with IXIARO(R) and to adapt or confirm mathematical models accordingly.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

Japanese Encephalitis (JE) is a potentially devastating mosquito-borne viral disease. The JE virus (JEV), a Flavivirus, is endemic to many regions in Asia, and while JE is primarily a pediatric disease in the endemic regions, travelers from non-endemic regions to Asia are usually naïve to the virus and may be at risk for contracting JE at any age.

The present study aims to investigate antibody titers at approximately 6 years after the third dose of JE vaccine (JE-VC), in a cohort of participants from an earlier booster dose trial, to strengthen the statistical model of the duration of protection after the booster.

Study Type

Interventional

Enrollment (Actual)

67

Phase

  • Phase 4

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Austria
    • Kinderspitalgasse 15
      • Vienna, Kinderspitalgasse 15, Austria, 1090
        • Institute for Specific Prophylaxis and Tropical Medicine

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Subjects who received a booster dose of JE-VC in study IC51-311
  • Subjects who are willing to give written informed consent to participate in the trial

Exclusion Criteria:

  • Subjects who received a further dose of any Japanese Encephalitis Vaccine since study IC51-311
  • Severe immunosuppression (as result of medical conditions or medication) since study IC51-311, such as history of radiation therapy or cytostatic therapy
  • simultaneous participation in another clinical study

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Other: Single arm
1 blood draw
Other: Blood draw
One-time blood draw

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Geometric Mean Titer (GMT) for JEV neutralizing antibodies determined by PRNT
Time Frame: 1.5 years
1.5 years

Secondary Outcome Measures

Outcome Measure
Time Frame
Seroprotection Rate (SPR) defined as rate of subjects with JEV neutralizing antibody titers ≥1:10 in a PRNT
Time Frame: 1.5 years
1.5 years

Other Outcome Measures

Outcome Measure
Time Frame
Projected mean duration of protection after a booster dose of JE-VC
Time Frame: 1.5 years
1.5 years

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Medical University of Vienna

Investigators

  • Principal Investigator: Herwig Kollaritsch, Prof. Dr., Medizinische Universität Wien, Institut für Spezifische Prophylaxe und Tropenmedizin 1090 Wien, Kinderspitalgasse 15

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

February 1, 2014

Primary Completion (Actual)

June 1, 2014

Study Completion (Actual)

June 1, 2014

Study Registration Dates

First Submitted

January 16, 2014

First Submitted That Met QC Criteria

January 16, 2014

First Posted (Estimate)

January 17, 2014

Study Record Updates

Last Update Posted (Estimate)

February 23, 2015

Last Update Submitted That Met QC Criteria

February 20, 2015

Last Verified

February 1, 2015

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 311_FU2013
  • 2013-004366-34 (EudraCT Number)

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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