Seoul: South Korea on Monday said it planned to cull a record 5.3 million birds as it announced its 17th case of bird flu in three weeks.

South Korea has culled 4.86 million chickens and ducks since the beginning of April, after bird flu cases were confirmed in five provinces.

The agriculture ministry said on Monday it would start probing all of the country's 260 duck farms as a preemptive measure and continue quarantine work.

Some 360 soldiers have been sent to the hardest-hit North Jeolla province to help slaughtering and burying farmed birds.