A duck farm in Jangheung, Jeollanam-do, South Korea, has seen a mass death of ducks due to the detection of the H5-type avian influenza (AI) antigen in carcasses. Following this, 71,000 ducks have been culled from five farms within a 1 km radius, and a quarantine area has been established around the affected farm. Additionally, all poultry farms and related facilities in the province have been temporarily suspended for disinfection. This outbreak follows the detection of the same AI strain in wild birds at Gangjin Bay Ecological Park and Suncheon Bay.