First Japanese encephalitis mosquito detected in South Korea's Jeonbuk Province, national alert remains high

South Korea is on alert after the first detection of the 'Orthohelea' mosquito, the primary vector for Japanese encephalitis, in Jeonbuk Province this year. The discovery, made on May 14th, occurred about a week later than last year, a delay attributed by the Jeonbuk Institute of Health and Environment to prolonged monsoon rains and frequent precipitation affecting mosquito breeding cycles.

Although the mosquito tested negative for Japanese encephalitis, dengue fever, and Zika virus, the public health warning remains significant. A nationwide Japanese encephalitis alert is already in effect. The first vector mosquito of the season was found in Jeju on March 20th, leading to a caution advisory, and a full alert was issued on June 17th when the virus gene was detected in mosquitoes collected in Daegu.

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As the intense heat begins after the monsoon season, the risk of mosquito-borne infectious diseases will further increase.

The Orthohelea mosquito is a small, dark brown insect typically found in rice paddies and livestock facilities, active mainly at night. While most infections are asymptomatic or cause mild fever, vulnerable populations like infants and the elderly can develop severe acute encephalitis, characterized by high fever and headaches. This condition has a mortality rate of 20-30% and can lead to severe neurological complications even after recovery, underscoring the critical need for preventative measures.

Jeon Gyeong-sik, director of the Jeonbuk Institute of Health and Environment, emphasized the increased risk of mosquito-borne diseases as the intense summer heat follows the monsoon season. He strongly recommended that children between 12 months and 12 years old complete their Japanese encephalitis vaccinations according to the standard schedule, as an effective vaccine is available.

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Japanese encephalitis has an effective vaccine, so please ensure children aged 12 months to 12 years complete their vaccinations according to the standard immunization schedule.