Japanese encephalitis virus (JEV) is transmitted to humans and other animals by the bite of infected mosquitoes. Pigs are important in JEV transmission because pigs develop high levels of viremia sufficient to infect mosquitoes (amplifying host).
There are two safe and effective vaccines for JE:
A JEV vaccine is available for free for people who are at higher risk of catching the virus.
Learn who is recommended to be vaccinated against Japanese encephalitis.
JEV booster vaccination is recommended for some people at-risk of JEV, 1-2 years after they were last fully vaccinated.
For more information, see the Australian Immunisation Handbook.
NSW Health continually reviews the evidence related to JEV risk in NSW in consultation with a range of health and environmental experts.
Vaccine doses can be ordered through the State Vaccine Centre. For large volume orders, please contact the local public health unit.
Symptoms of JE include:
If patients present with symptoms of encephalitis, include JE in your differential diagnosis if they live or have visited rural areas, especially if they were near pig farms or report being bitten by mosquitos.
Refer patients with suspected JE to hospital for management and further investigation.