Despite the foretunately negative reaction in the two more suspected cases, this weekend will likely be a critical crossroads to fight the disease, as quarantine officials have said the incubation period for the virus is a week or more.

In North Korea in late May, a case of African swine fever was reported in Jagang Province, which borders China. But the South Korean government has no information as to whether there was outbreak in the southern part of North Korea, close to Paju and Yeoncheon, over the past few months.

Paju borders on Incheon’s Ganghwa county and on the cities of Gimpo, Goyang, Yangju and Uijeongbu in Gyeonggi Province. Yeoncheon is close to Dongducheon and Pocheon, both in Gyeonggi Province, and to Cheorwon in neighboring Gangwon Province.

According to the Korea Institute for Animal Products Quality Evaluation, located near the Government Complex Sejong, the 6,000 farms nationwide have a total of 11.3 million hogs.

South Chungcheong Province, where regions such as Hongseong and Cheonan are home to large-scale farm villages, topped the list with 2.3 million pigs, followed by Gyeonggi Province with 1.9 million.

Gyeonggi has the largest number of hog farms, 1,250, and South Chungcheong is next with 1,142. Together, the two provinces account for 35-40 percent of hog farms nationwide. Other major hog farming regions include North Gyeongsang Province and North Jeolla Province.

African swine fever has a 100 percent mortality rate for infected pigs, but doctors and veterinarians say it cannot infect humans. Cooked pork presents little risk, even if the pigs were infected with the virus, according to ministry officials.

By Kim Yon-se (kys@heraldcorp.com)