Japanese encephalitis virus

Japanese encephalitis virus is one of the most common causes of viral encephalitis – inflammation of the brain – in Asia with 30,000–50,000 clinical cases reported annually. The virus is transmitted by specific mosquito groups which tend to breed in flooded rice fields. Children are particularly at risk of severe illness with clinical features including unconsciousness and seizures.

The map shows study sites in the Mekong region where Japanese encephalitis virus was reported in one or more of the 146 published studies reviewed during the pilot study.


Guide to using the map:

The colour of a map marker indicates the percentage of samples found to be positive for the identified bacterium or virus. For example, a purple marker indicates no positive cases found; a red marker indicates that more than 30% samples were positive.

Click on a map marker to view basic descriptive data including study type, frequency of a positive result and the study citation.

If you have any questions about the data, please email info [at] wwarn [dot] org