In this 2014 file photo, health workers in full protective gear collect dead chickens killed by using carbon dioxide, after bird flu was found in some birds at a wholesale poultry market in Hong Kong. New strains of the H7N9 bird flu virus in China has shown the potential to possibly cause a global pandemic. Photo: AP

Topic |   H7N9 virus
In this 2014 file photo, health workers in full protective gear collect dead chickens killed by using carbon dioxide, after bird flu was found in some birds at a wholesale poultry market in Hong Kong. New strains of the H7N9 bird flu virus in China has shown the potential to possibly cause a global pandemic. Photo: AP
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