SHILLONG, Jan 22 – Culling of birds in Williamnagar town of East Garo Hills district and in 35 villages within a 10-km radius of the town has been completed, official sources said today. Culling of birds had started after the Bhopal-based High Security Animal Disease Laboratory (HSADL) confirmed H1N1 virus in blood samples of fowls collected from a government-run poultry farm in the district on January 11.