NEW : Nanjing becomes third city to suspend live poultry trading . The move comes after a series of scandals involving the sale and slaughter of chickens in China that have led to public outrage over what many see as inhumane treatment for animals. No cases of human-to-human transmission have been confirmed . Chinese authorities have killed more than 20,000 birds from a live-poultry trading zone in Shanghai in an effort to deal with the issue . Poultry markets in Shanghai and Hangzhou were closed .
NEW : Nanjing becomes third city to suspend live poultry trading . The move comes after a series of scandals involving the sale and slaughter of chickens in China that have led to public outrage over what many see as inhumane treatment for animals. No cases of human-to-human transmission have been confirmed . Poultry markets in Shanghai and Hangzhou were closed .