A technician shows the test reagents for the H7 influenza infection (L) and the N9 influenza infection at the centre for diseases control and prevention in
A technician shows the test reagents for the H7 influenza infection (L) and the N9 influenza infection at the centre for diseases control and prevention in Hefei, Anhui province April 5, 2013. Chinese authorities slaughtered over 20,000 birds on Friday at a poultry market in the financial hub Shanghai as the death toll from a new strain of bird flu mounted to six, spreading concern overseas and sparking a sell-off on Hong Kong's share market. (Jianan Yu / Reuters)