There'd been hopes that South Korea's outbreaks of African swine fever were over but another case has been confirmed making it the 14th case.
The agriculture ministry said Wednesday that a pig farm in Yeoncheon county in Gyeonggi-do Province tested positive.
It's the second confirmed case in that area.
The ministry immediately dispatched quarantine personnel and restricted the movement of people and vehicles there.
A 48-hour standstill order has been also imposed.
Yeoncheon is one of six cities and counties in South Korea that have been newly designated as buffer zones.