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This photo taken on on February 17, 2014 shows chickens at a poultry market that has been closed due to the risk of spreading the H7N9 bird flu virus in Hangzhou, Zhejiang Province. So far this year China has confirmed 115 human H7N9 cases, including 25 deaths. AFP PHOTO/Mark RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)

This photo taken on on February 17, 2014 shows chickens at a poultry market that has been closed due to the risk of spreading the H7N9 bird flu virus in Hangzhou, Zhejiang Province.  So far this year China has confirmed 115 human H7N9 cases, including 25 deaths.     AFP PHOTO/Mark RALSTON        (Photo credit should read MARK RALSTON/AFP/Getty Images)