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 first dose of Jenvac Vaccine is generally given at 9 to 12 months of age and the second dose at 16 to 24 months of age. The vaccine is recommended for people moving to a Japanese encephalitis (JE)-endemic country, travelers who plan to stay for more than 1 month in JE-endemic areas, and frequent travelers to JE-endemic areas. This vaccine should also be considered for shorter-term (less than 1 month) travelers with an increased risk of JE. Common side effects of this medicine include injection site reactions (such as soreness, swelling, pain, or redness), headache, fever, muscle pain, nausea, and fatigue. Before receiving the vaccine, you should let your doctor if you have ever had an allergic reaction to a vaccine. Also tell your doctor if you have any problems with your heart, kidneys, or liver. Some other medicines may react with this vaccine, let your doctor know of all the medication you are taking. Pregnant or breastfeeding should consult their doctors first before receiving this vaccine.