中文摘要：

细菌小RNA（small RNA,sRNA）是一类长度为50-500个碱基,具有调控转录、翻译和mRNA稳定性的非编码调节性RNA。随着越来越多的sRNA被鉴定,部分细菌的sRNA功能已逐步阐明,主要参与调控细菌的基因表达、增殖、毒力及对环境的应激反应等生物学过程。本文就胞内菌（如沙门菌、李斯特菌、嗜肺军团菌等）sRNA对其自身在宿主细胞内的生长、毒力和铁水平的调控作用进行综述。

英文摘要：

Small RNA（sRNA）is a class of non-coding RNA of 50-500 bases with a regulatory function on transcription,translation and mRNA stability.Bacterial sRNAs have been implicated in gene expression,cellular proliferation,virulence and adaptation to environmental conditions.The role of sRNAs in intracellular infection（such as Salmonella,Listeria,Legionella pneumophia,etc.）,including the regulation on growth,virulence and host iron levels is reviewed in this paper.