Objectives To comprehensively analyze the results of surveillance of influenza,avian influenza,and unidentified pneumonia from 2009 to 2014in Ji'nan and to evaluate the risk of the avian influenza virus infecting humans. Methods A system was established to monitor avian influenza.This system monitored environmental samples for avian influenza,it monitored occupational exposure serologically,it monitored influenza at sentinel hospitals,and it monitored unexplained pneumonia. Results In total,1 151 environmen...