In this April 3, 2013 photo, a worker pushes a cart as live pigeons are sold at a cage at a poultry wholesale market in Shanghai China. China announced a sixth death from the new bird flu H7N9 strain Friday, while authorities in Shanghai halted the sale of live fowl and slaughtered all poultry at a market where the virus was detected in pigeons being sold for meat. The first cases were announced Sunday.