BAOFENG, CHINA – APRIL 17: (CHINA OUT) A health worker sprays disinfectant at a poultry farm on April 17, 2013 in Baofeng, China. China has reported 77 cases of H7N9 avian influenza, including 16 deaths, and the government expect that figure to rise. (Photo by ChinaFotoPress/ChinaFotoPress via Getty Images)