OBJECTIVE To understand the prevalence of healthcare-associated infections(HAI)and establish the reference system of HAI indicators so as to provide guidance for control of the HAI.METHODS In Sep 2013,a cross-sectional survey was conducted to investigate the prevalence of HAI and use of antibiotics of the patients who were hospitalized in 66 hospitals of Tianjin,and the statistical analysis of data was performed with the use of SPSS17.0software.RESULTS Totally 29 524 patients were expected to survey,and 29 ...