Health workers in full protective gear pick up a killed chicken after suffocated them by using carbon dioxide at a wholesale poultry market in Hong Kong, Tuesday, Jan. 28, 2014. Hong Kong authorities

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Health workers in full protective gear pick up a killed chicken after suffocated them by using carbon dioxide at a wholesale poultry market in Hong Kong, Tuesday, Jan. 28, 2014. Hong Kong authorities began culling 20,000 birds at a wholesale market after poultry from southern mainland China tested positive for the H7N9 virus, the first time it had been found in imported poultry in Hong Kong. (AP Photo/Vincent Yu) less 

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Associated Press
Tue, Jan 28, 2014 2:18 PM EST