The picture taken on Jan. 27 shows a closed duck farm in Dingdang Town of Long'an County, southwest China's Guangxi Zhuang Autonomous Region. Chinese authorities confirmed Tuesday that the death of ducks on Jan. 23 in this town was caused by the bird flu virus. So far, the local government slaughtered 14,000 heads of poultry within three kilometers radius of the duck farm, and vaccinated all poultry outside three kilometers and within five kilometers of the duck farm. (Xinhua Photo)

An epidemic prevention worker sprays disinfectant on a car passing Dingdang Town. (Xinhua Photo)