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医院内获得性肺炎（ＮＰ）是指入院４８ｈ后获得的呼吸系统感染，并排除入院时处于潜伏期的任何感染；院内感染中以其高发病率和高死亡率［１］而受到重视。作者分析本院１００例老年ＮＰ，旨在了解其临床特征和病原学特点，以便指导临床选择有效抗菌药物。１ 临床资料１．１
In-hospital acquired pneumonia (NP) is a respiratory infection acquired 48 h after admission and excludes any latent infection at admission; nosocomial infections are valued for their high morbidity and mortality [1]. The author analyzes our hospital 100 cases of elderly NP, aimed at understanding its clinical features and etiological characteristics in order to guide the clinical selection of effective antimicrobial agents. 1 clinical data 1.1