Jenvac Vaccine is a medicine used for prevention of Japanese encephalitis (JE). It protects against JE and is given as part of universal immunization program for selected places endemic to JE. Your doctor will decide if you should receive Jenvac Vaccine based on your situation. It is given as a subcutaneous injection. The primary vaccination may be given to children between 1 years to 3 years of age. Adults can receive the same at or after 18 years upto 49 years of age.