SEOUL, Sept. 9 (Yonhap) -- South Korea's health authorities on Friday issued a nationwide warning against the spread of

encephalitis for the first time this year, advising people to keep personal hygiene and receive vaccinations.

The Korea Centers for Disease Control and Prevention (KCDC) said it has found the virus of Japanese encephalitis in mosquito

samples collected in the southern port city of Busan.

If bitten by virus-carrying mosquitos, people with the weak immune system, usually children, can suffer from fever, vomiting

and diarrhea and could die in the worst case, it said.