OBJECTIVE To investigate the efficacy and safety of linezolid in empirical treatment of severe pneumonia so as to achieve the purpose of curing severe pneumonia with empirical treatment.METHODS Totally 52 patients with severe pneumonia in the department of respiration of our hospital from Jun.2010 to Dec.2012 were analyzed retrospectively.The patients were divided into five groups according to age,initial application time,drug combination,characteristics of lung CT,and etiologic results of treatment after 4...