The directive comes after the sixth case of the virus this year, which is deadly to pigs but not harmful to humans, was confirmed in about 900 people in Yecheon county, 161 kilometers southeast of Seoul, Yonhap news agency reported. Was born in a farm that reared pigs.

Han ordered officials to take relevant measures, including the killing, a pause order and an epidemiological analysis, the prime minister's office said in a statement.

A stay order has been issued in Yecheon and six other surrounding counties and cities, including Andong and Yeongju, until 6 a.m. Monday.

Authorities plan to conduct an epidemiological investigation, cull the pigs at the farm, and disinfect the site and nearby roads.

The agriculture ministry said the culling is not expected to affect the supply of pigs to the local market, noting that the farm in question produces only 0.008 percent of the total number of pigs in the country.