The major risk factors of hospital infection include age, entity, serious degree of pathogenetic condition, length of stay, application of drug of patient, and the management modality of hospital etc.

• 患者的年龄、病种、病情严重程度、住院时间、药物应用以及标本的送检率和医院的管理方式等都是引起医院感染的主要危险因素。