What should you know about live attenuated Japanese encephalitis vaccine?

Japanese encephalitis is an infection spread by mosquitoes in some regions. A live attenuated vaccine presents a weakened virus to the immune system so it can recognise the infection later. Vaccination does not prevent every mosquito-borne illness, so bite avoidance remains useful.

Whether this vaccine is suitable depends on travel plans, destination and season, age, pregnancy, immune health, allergies and previous vaccines. Different live vaccines, including those used for chickenpox or yellow fever, have their own eligibility rules.

Discuss vaccination before travel, allowing time for a clinician to review your itinerary and health history. Bring details of planned destinations, dates, regular medicines, allergies and prior immunisations. Use repellent, covered clothing, screens and a bed net where appropriate because mosquitoes can bite outside as well as indoors.

After vaccination, follow the clinic's advice. Soreness, tiredness or a mild fever may occur. Keep a record of the vaccine and ask how it fits with other live vaccines or upcoming travel requirements.

Seek urgent help for breathing difficulty, swelling of the face or throat, collapse, confusion or a seizure after vaccination. During or after travel, prompt medical assessment is needed for fever, severe headache, vomiting, neck stiffness, drowsiness or a seizure, since these symptoms can signal a serious infection.

Ask whether your destination creates a vaccination need, when protection should be planned, whether your medicines affect eligibility, and how to space other live vaccines. Ask which travel symptoms should trigger urgent assessment.