Via Guangzhou Ribao, a January 10 report: Haizhu a restaurant chopping avian influenza virus. Excerpt from a Google translation:
Reporter correspondent Wu Yan Huang Sui) notification under the Provincial Planning Commission Guardian, January 7, Guangzhou CDC environmental samples in 17 unearned Haizhu District, Guangzhou Ying Fuk Court restaurant kitchens collected samples were detected in three H7N9 avian influenza virus nucleic acid positive.
Reporters learned that, in Guangzhou, Foshan confirmed H7N9 infection cases have been sent to poultry imported to the restaurant on January 6. In cases when the spaces within the scope of activities to be monitored, the disease control department detected H7N9 virus in samples of chopping and sewage in the restaurant kitchen. CDC said it had carried out cleaning and disinfection of the restaurant, the restaurant staff no suspicious symptoms.
Last year in April across the country and more cases of human H7N9 avian influenza infection, the disease control department of Guangzhou has been the external environment of the H7N9 virus monitoring, but monitoring sites, mainly in meat markets, wholesale poultry, bird habitat, etc., the city illnesses control center said that it will try to monitor the restaurant kitchen is also included in the range.
Monitoring all the restaurants in Guangzhou would be a daunting task. Wikipedia tells us the city's population in 2010 was 12.78 million. Throw in the whole Pearl River Delta, including Shenzhen, Dongguan, etc., and you're dealing with maybe 40 million people.