SHANGHAI (AFP) - Cities in eastern China where an H7N9 bird flu outbreak has killed six people moved to prevent the virus from spreading by banning live poultry trade and culling fowl. Nanjing city shut markets selling live poultry to its more than 8m residents, while Hangzhou culled birds after discovering infected quail, the Xinhua news agency said. Two more people were confirmed to be infected with the virus in Shanghai, state media said late Saturday, bringing to 18 the total number of cases since authorities last week announced the virus had been detected in humans. The human infections have been confined to eastern China , with Shanghai recording eight including four deaths, and the other two fatalities in Zhejiang.