H5N1 avian influenza was diagnosed in a breeding duck flock at Sde Yaakov in the Jezreel Valley Regional Council. Following unusual mortality among ducks at the farm, which includes about 2,000 ducks aged 41 weeks, samples were sent to the Ministry of Agriculture and Food Security laboratories, which confirmed the suspicion. This is the first case of bird flu diagnosed in the current season in commercial coops. The Veterinary Services at the Ministry of Agriculture and Food Security have defined a quarantine zone with a 10 km radius around the infected area.