Encephalitis, Japanese B Clinical Trial
Official title:
Long-Term Assessment at 24 Months Post-Vaccination of the Non-Inferiority of the Concurrent Administration of Japanese Encephalitis Live Attenuated SA 14-14-2 Vaccine and Measles Vaccine to Measles Vaccine Given Alone
The previously conducted JEV01 study looked at the immunogenicity and safety of the concurrent administration of Japanese Live Attenuated SA 14-14-2 and measles vaccines at the one month post vaccination time point. The purpose of the JEV01 study was to help ensure the safety of SA 14-14-2 simultaneously administered with measles vaccine, paving the way for its use in routine EPI programs. As a follow-on to JEV01, this study will enroll those infants who received both vaccines and completed the JEV01 study. This study, however, will provide crucial data to help ensure the long-term immunogenicity of the concurrent administration of these vaccines and provide valuable information to determine the use of these vaccines in routine immunization programs. This study is planned because in the original protocol for JEV01, long-term data points were not included. The hypothesis is that children who receive JE live attenuated SA 14-14-2 vaccine and measles vaccine at the same time have long-term (24 and 36 months post vaccination) protection against these diseases at the same level as those who receive the vaccines at different intervals.
Japanese encephalitis is the leading cause of viral neurological disease and disability in
Asia. The severity of sequelae, together with the volume of cases, make JE the most
important cause of viral encephalitis in the world. Approximately 3 billion people—including
700 million children—live in Asian areas at risk for JE. JE most commonly infects children
between the ages of 1 and 15 years, and can also infect adults in areas where the virus is
newly introduced. More than 50,000 cases are reported annually and cause an estimated 10,000
to 15,000 deaths. This figure is believed to represent only a small proportion of the
disease burden that actually exists.
An effective vaccine has existed since 1941, but has not reached the poorest countries in
Asia. During the 60 years that the vaccine has been available, JE has infected an estimated
10.5 million children, resulting in more than 3 million deaths and more than 4 million
children living with long-term disabilities. Control of this disease has been limited due to
poor disease surveillance, a limited and unstable vaccine supply, lack of guidance and
programmatic support for immunization, and limited advocacy.
A successful vaccine should be safe, efficacious, affordable, administered in a single dose,
and easily incorporated into the routine Expanded Programmes on Immunization (EPI) programs.
This trial is designed to determine the potential interference between the measles vaccine
and the Japanese encephalitis vaccine at 12, 24, and 36 months post-vaccination. As these
vaccines will be used in routine EPI systems at the same time, similar to how measles and
yellow fever vaccine (also a Flavivirus) are administered, it is imperative to collect
long-term data showing that neither vaccine interferes with seroconversion of the other when
co-administered.This information will help to ensure subject safety and facilitate
programmatic efficiency, reducing the number of immunization visits for both parents and
health care workers.
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Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Factorial Assignment, Masking: Open Label, Primary Purpose: Prevention
| Status | Clinical Trial | Phase | |
|---|---|---|---|
| Completed |
NCT00249769 -
Determining Safety and Efficacy of Japanese Encephalitis Vaccine When Given With Measles Vaccine
|
Phase 3 | |
| Completed |
NCT01408537 -
Immunogenicity and Safety of Inactivated Vero Cell Derived Japanese Encephalitis Vaccine in Thai Children
|
Phase 3 |