Officials in South Korea say they have discovered another case of highly contagious bird flu at a duck farm in the southern part of the country
The case is the fourth in just one month.
Agriculture Ministry officials plan to begin destroying more than 20,000 poultry within a three-kilometer radius of the duck farm. They also will restrict the movement of poultry within a 10-kilometer radius to keep the disease from spreading.
The duck farm is located in Asan, about 92 kilometers south of the capital, Seoul.
The three other cases of bird flu were found at farms in North Cholla province, around 170 kilometers south of the capital.
The four recent incidents are the first known outbreaks of bird flu in South Korea in three years. The nation destroyed more than five million birds during a 2003 outbreak.
The H5N1 strain of bird flu has killed more than 150 people worldwide. No one is known to have died from the disease in South Korea. It is not clear yet whether this latest outbreak of bird flu involves the H5N1 strain.
Some information for this report was provided by AP and Reuters.