The Korea Centers for Disease Control and Prevention confirmed that the Japanese encephalitis vector(Culex Pipien) collected in Busan from Jul 20 to 21 accounts for 50 % of the total mosquito density. Then the disease control agency has issued nationwide Japanese encephalitis warning.

The infected are asymptomatic or show mere symptoms of fever and headache. However, the symptoms may progress into high fever, headache, nuchal rigidity, convulsion and 30% of them even die from the disease. Thus vaccination against Japanese encephalitis is necessary.

Targets of National immunization program(children between the ages of 12 months and 12 years) should get vaccinated on the standard vaccination schedule. The free vaccination is available in public health centers and designated medical institutions nationwide regardless of address.