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Update on Japanese Encephalitis (JE) Vaccine for U.S. ChildrenKey DocumentsIxiaro clinical trial sites [PDF - 1 page] Travelers’ health clinics in Asia [PDF - 2 pages] JE vaccines in the U.S.Inactivated mouse brain-derived JE vaccine (JE-MB [manufactured as JE-VAX]), the only JE vaccine that is licensed for use in children in the United States, is no longer available. JE-MB has been licensed in the United States since 1992 for use in adults and children aged ≥1 year. However, JE-MB is no longer being produced and all remaining doses expired in May 2011. In 2009, the Food and Drug Administration (FDA) approved an inactivated Vero cell culture-derived JE vaccine (JE-VC [manufactured as IXIARO]) for use in adults aged ≥17 years. One pediatric clinical trial with JE-VC has been completed in 60 children aged 12 to 35 months in India (48 children received JE-VC and 12 children received an inactivated mouse brain-derived JE vaccine [manufactured as JenceVac]). A safety and immunogenicity study is ongoing in approximately 1,900 children aged 2 months through 17 years in the Philippines, and a safety and immunogenicity bridging study has been initiated in the United States and other non-endemic countries with a targeted enrollment of approximately 100 children. Despite these ongoing studies, it will likely be several years before JE-VC is licensed in the United States for use in children. JE-VC product information is available online at the FDA IXIARO webpage. Other JE vaccines are manufactured and available for pediatric use in Asia but are not licensed in the United States.
Recommendations for the prevention of JE among travelersFor most travelers to Asia, the risk for JE is very low but varies on the basis of destination, duration, season, and activities. The Advisory Committee on Immunization Practices (ACIP) recommends that all travelers, including children, should take precautions to avoid mosquito bites to reduce the risk for JE and other vector-borne infectious diseases. These precautions include using insect repellent, permethrin-impregnated clothing, and bed nets, and staying in accommodations with screened or air-conditioned rooms. Additional information on protection against mosquitoes and other arthropods is available in CDC's Health Information for International Travel (Yellow Book). For some travelers who will be in a high-risk setting based on season, location, duration, and activities, JE vaccine can further reduce the risk for infection. ACIP recommendations for the use of JE vaccine are available from CDC in the MMWR Recommendations and Reports. Current options for obtaining JE vaccine for U.S. childrenFor U.S. health-care providers interested in obtaining JE vaccine for pediatric patients, current options include:
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