An official holds a chicken during the checking of poultry at the border with mainland China in Hong Kong on April 11, 2013 as authorities step up measures against the spread of the deadly H7N9 bird flu.  The number of cases of the H7N9 strain of avian influenza rose to 33 in the mainland on April 10, with nine deaths since China announced that it had been found in humans for the first time.  AFP PHOTO / Philippe LopezAn official holds a chicken during the checking of poultry at the border with mainland China in Hong Kong on April 11, 2013 as authorities step up measures against the spread of the deadly H7N9 bird flu.  The number of cases of the H7N9 strain of avian influenza rose to 33 in the mainland on April 10, with nine deaths since China announced that it had been found in humans for the first time.  AFP PHOTO / Philippe Lopez
An official holds a chicken during the checking of poultry at the border with mainland China in Hong Kong on April 11, 2013 as authorities step up measures against the spread of the deadly H7N9 bird flu. The number of cases of the H7N9 strain of avian influenza rose to 33 in the mainland on April 10, with nine deaths since China announced that it had been found in humans for the first time. AFP PHOTO / Philippe Lopez

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An official holds a chicken during the checking of poultry at the border with mainland China in Hong Kong on April 11, 2013 as authorities step up measures against the spread of the deadly H7N9 bird flu.  The number of cases of the H7N9 strain of avian influenza rose to 33 in the mainland on April 10, with nine deaths since China announced that it had been found in humans for the first time.  AFP PHOTO / Philippe LopezAn official holds a chicken during the checking of poultry at the border with mainland China in Hong Kong on April 11, 2013 as authorities step up measures against the spread of the deadly H7N9 bird flu.  The number of cases of the H7N9 strain of avian influenza rose to 33 in the mainland on April 10, with nine deaths since China announced that it had been found in humans for the first time.  AFP PHOTO / Philippe Lopez
An official holds a chicken during the checking of poultry at the border with mainland China in Hong Kong on April 11, 2013 as authorities step up measures against the spread of the deadly H7N9 bird flu. The number of cases of the H7N9 strain of avian influenza rose to 33 in the mainland on April 10, with nine deaths since China announced that it had been found in humans for the first time. AFP PHOTO / Philippe Lopez
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