OBJECTIVE To observe the characteristics of pathogens causing infections in elderly patients with hospital-acquired pneumonia(HAP)and explore the influencing factors for prognosis so as to provide guidance for clinical treatment of the elderly patients with HAP.METHODS The clinical data of 120 elderly patients with HAP who were treated in the hospital from Jun 2011 to Dec 2014 were retrospectively analyzed.The distribution of pathogens,drug resistance of main pathogens,and influencing factors for prognosis ...