Bird flu hits China

Chinese authorities slaughtered over 20,000 birds at a poultry market in

Shanghai as the death toll from a new strain of bird flu grew, spreading concern overseas and sparking a sell-off in

airline shares in Europe and Hong Kong.

HONG KONG - APRIL 12: A vendor weighs a live chicken at the Kowloon City Market on April 12, 2013 in Hong Kong. Local authorities have stepped up the testing of live poultry imports from China to include a rapid test for the H7N9 'bird flu' virus. Measures were put in place as the tenth victim of the influenza strain was confirmed in mainland China yesterday. (Photo by Lam Yik Fei/Getty Images)
Hong Kong Tests Live Chicken Imports As Chinese Bird Flu Deaths Reaches 10
HONG KONG - APRIL 12: A vendor weighs a live chicken at the Kowloon City Market on April 12, 2013 in Hong Kong. Local authorities have stepped up the testing of live poultry imports from China to include a rapid test for the H7N9 'bird flu' virus. Measures were put in place as the tenth victim of the influenza strain was confirmed in mainland China yesterday. (Photo by Lam Yik Fei/Getty Images)
HONG KONG - APRIL 12: People wear face masks outside the Princess Margaret Hospital on April 12, 2013 in Hong Kong. Local authorities have stepped up the testing of live poultry imports from China to include a rapid test for the H7N9 'bird flu' virus. Measures were put in place as the tenth victim of the influenza strain was confirmed in mainland China yesterday. (Photo by Lam Yik Fei/Getty Images)
Hong Kong Tests Live Chicken Imports As Chinese Bird Flu Deaths Reaches 10
HONG KONG - APRIL 12: People wear face masks outside the Princess Margaret Hospital on April 12, 2013 in Hong Kong. Local authorities have stepped up the testing of live poultry imports from China to include a rapid test for the H7N9 'bird flu' virus. Measures were put in place as the tenth victim of the influenza strain was confirmed in mainland China yesterday. (Photo by Lam Yik Fei/Getty Images)
HONG KONG - APRIL 12: A vendor carries live chickens at the Wholesale Poultry Market in Cheung Sha Wan on April 12, 2013 in Hong Kong. Local authorities have stepped up the testing of live poultry imports from China to include a rapid test for the H7N9 'bird flu' virus. Measures were put in place as the tenth victim of the influenza strain was confirmed in mainland China yesterday. (Photo by Lam Yik Fei/Getty Images)
Hong Kong Tests Live Chicken Imports As Chinese Bird Flu Deaths Reaches 10
HONG KONG - APRIL 12: A vendor carries live chickens at the Wholesale Poultry Market in Cheung Sha Wan on April 12, 2013 in Hong Kong. Local authorities have stepped up the testing of live poultry imports from China to include a rapid test for the H7N9 'bird flu' virus. Measures were put in place as the tenth victim of the influenza strain was confirmed in mainland China yesterday. (Photo by Lam Yik Fei/Getty Images)
HONG KONG - APRIL 12: A vendor weighs a live chicken at the Kowloon City Market on April 12, 2013 in Hong Kong. Local authorities have stepped up the testing of live poultry imports from China to include a rapid test for the H7N9 'bird flu' virus. Measures were put in place as the tenth victim of the influenza strain was confirmed in mainland China yesterday. (Photo by Lam Yik Fei/Getty Images)
Hong Kong Tests Live Chicken Imports As Chinese Bird Flu Deaths Reaches 10
HONG KONG - APRIL 12: A vendor weighs a live chicken at the Kowloon City Market on April 12, 2013 in Hong Kong. Local authorities have stepped up the testing of live poultry imports from China to include a rapid test for the H7N9 'bird flu' virus. Measures were put in place as the tenth victim of the influenza strain was confirmed in mainland China yesterday. (Photo by Lam Yik Fei/Getty Images)
HONG KONG - APRIL 12: A vendor weighs a live chicken at the Kowloon City Market on April 12, 2013 in Hong Kong. Local authorities have stepped up the testing of live poultry imports from China to include a rapid test for the H7N9 'bird flu' virus. Measures were put in place as the tenth victim of the influenza strain was confirmed in mainland China yesterday. (Photo by Lam Yik Fei/Getty Images)
Hong Kong Tests Live Chicken Imports As Chinese Bird Flu Deaths Reaches 10
HONG KONG - APRIL 12: A vendor weighs a live chicken at the Kowloon City Market on April 12, 2013 in Hong Kong. Local authorities have stepped up the testing of live poultry imports from China to include a rapid test for the H7N9 'bird flu' virus. Measures were put in place as the tenth victim of the influenza strain was confirmed in mainland China yesterday. (Photo by Lam Yik Fei/Getty Images)
HONG KONG - APRIL 12: A vendor washes empty chicken cages at the Kowloon City Market on April 12, 2013 in Hong Kong. Local authorities have stepped up the testing of live poultry imports from China to include a rapid test for the H7N9 'bird flu' virus. Measures were put in place as the tenth victim of the influenza strain was confirmed in mainland China yesterday. (Photo by Lam Yik Fei/Getty Images)
Hong Kong Tests Live Chicken Imports As Chinese Bird Flu Deaths Reaches 10
HONG KONG - APRIL 12: A vendor washes empty chicken cages at the Kowloon City Market on April 12, 2013 in Hong Kong. Local authorities have stepped up the testing of live poultry imports from China to include a rapid test for the H7N9 'bird flu' virus. Measures were put in place as the tenth victim of the influenza strain was confirmed in mainland China yesterday. (Photo by Lam Yik Fei/Getty Images)

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