Japanese encephalitis is a mosquito-borne infection that leads to swelling of the brain. It can affect the central nervous system and cause severe complications, even death.
Factors that may increase your chance of Japanese encephalitis include:
Symptoms of Japanese encephalitis usually appear 5-15 days after the bite from an infected mosquito.
Japanese encephalitis may cause:
Your doctor will ask about your symptoms and medical history. A physical exam will be done.
Tests may include the following:
Imaging tests to assess the brain include:
Since there is no specific treatment for Japanese encephalitis. Care is focused on treating specific symptoms and complications.
There is a Japanese encephalitis vaccine. It is recommended for people who live or travel in certain parts of Asia and for lab workers who are at risk of exposure to the virus.
Also, take the following measures to protect yourself from mosquito bites:
Infectious Disease Society of America
Centers for Disease Control and Prevention
Public Health Agency of Canada
Japanese encephalitis. Centers for Disease Control and Prevention website. Available at: http://www.cdc.gov/japaneseencephalitis. Accessed November 12, 2012. Accessed November 13, 2014.
Japanese encephalitis. EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed. Updated February 12, 2014. Accessed November 13, 2014.
Japanese encephalitis VIS. Centers for Disease Control and Prevention website. Available at: http://www.cdc.gov/vaccines/hcp/vis/vis-statements/je-ixiaro.html. Updated January 24, 2014. Accessed November 13, 2014.
Vaccine is key to preventing outbreaks of Japanese encephalitis. UNICEF website. Available at: http://www.unicef.org/immunization/india_28555.html. Accessed November 13, 2014.
10/1/2013 DynaMed Systematic Literature Surveillance http://www.ebscohost.com/dynamed: Reimer LJ, Thomsen EK, et al. Insecticidal bed nets and filariasis transmission in Papua New Guinea. N Eng J Med. 2013;369(8):745-753.
Last reviewed December 2014 by David L. Horn, MD, FACP
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.