Japanese Encephalitis Vaccine

Paul G. Auwaerter, M.D., Kathryn Dzintars, Pharm.D. BCPS
Pediatric Dosing Author: Lisa Hutchins, Pharm.D.


  1. Inactivated SA-14 virus strain: grown in Vero cells (IXIARO).
    1. The only licensed vaccine in the U.S. is indicated in the U.S. for all persons > 2 months of age.
    2. The same vaccine is sold in other countries as JESPECT.
  2. In some other countries, a live, attenuated SA-14 strain vaccine is available.
  3. The previously available (Biken) vaccine grown in mouse-brain is only available in Japan.

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Last updated: April 16, 2023