China reported six new cases of H7N9 bird flu including one death in Hunan province after live poultry markets in the province were closed last month. The infections were reported in the last week of March by the provincial center for disease control and prevention. A total ban on live poultry trading in Changsha had been in effect since March 17 and would continue for another five days. In March, the authorities reported an outbreak of the virus in the province originating from a farm with about 29,760 infected birds. More than 170,000 birds were culled as a result. The number of human infections this season has surged to the highest level since 2009, with at least 162 deaths reported since October. Health authorities said that cold and wet weather in Hunan played a role in the recent spread of the virus. Medical specialists have said attempts by authorities to curb the spread of the H7N9 bird flu virus in live poultry markets came too late, with officials failing to take preventative steps before the peak flu season started. The H7N9 virus shows little or no clinical symptoms in poultry, complicating detection, but authorities should have stepped up their surveillance going into the peak season, the specialists said.