OBJECTIVE To study the related factors of pulmonary infections in the patients with acute exacerbation of chronic obstructive pulmonary disease(COPD) and analyze the drug resistance so as to reduce the incidence of pulmonary infections in the patients with acute exacerbation of COPD.METHODS A total of 68 cases of acute exacerbations of COPD patients complicated with pulmonary infections,who were treated in the hospital from Jan 2009 to Jun 2012,were selected as the pulmonary infection group,while 68 cases o...