What are the symptoms of Japanese encephalitis?
For most people (around 99%), there will be no symptoms of infection. However, in a small number of cases, symptoms of Japanese encephalitis may begin 5-15 days after infection from a mosquito bite.
The initial symptoms may be severe shivering and chills, fever, headache, nausea and a stiff neck. Neurological (nervous system) symptoms may include disorientation, unconsciousness, tremors, seizures, convulsions, paralysis, coma, and death. Recovery can take a long period of time, and carries a high likelihood of on-going neurological symptoms, including deafness and partial paralysis.
Call out fact: Less than 1% of people infected with the Japanese encephalitis virus develop clinical illness.
Less than 1% of people infected with the Japanese encephalitis virus develop clinical illness.
Sources & Citations
- South Australian Government. Department of Health. Japanese Encephalitis. Available at http://www.sahealth.sa.gov.au/wps/wcm/connect/public+content/sa+health+internet/health+topics/health+conditions+prevention+and+treatment/infectious+diseases/japanese+encephalitis (accessed 28 March 2018).
- Queensland Government. Department of Health. Communicable Disease Control Guidance. Japanese Encephalitis (v1 March 2010; v1.1 April 2011). Available at: https://www.health.qld.gov.au/cdcg/index/jev (accessed 28 March 2018).
- NSW Government, Department of Health, Communicable Diseases Factsheet – Japanese Encephalitis. Available at; http://www.health.nsw.gov.au/Infectious/factsheets/Pages/japanese_encephalitis.aspx (accessed 28 March 2018).
- Centers for Disease Control and Prevention. Japanese Encephalitis. Available at: https://www.cdc.gov/japaneseencephalitis/index.html (accessed 28 March 2018).
- The Australian Immunisation Handbook 10th Edition. 4.8 Japanese Encephalitis. Available at http://www.immunise.health.gov.au/internet/immunise/publishing.nsf/Content/Handbook10-home~handbook10part4~handbook10-4-8 (accessed 28 March 2018).
SPANZ.IMOJ.18.04.0141a - Date of preparation May 2018Show All