ObjectiveTo explore the risk factors for nosocomial infection （NI）of Acinetobacter baummanii (A. baumannii) in patients in the internal medicine intensive care units (ICUs).MethodsA 1：2 matched casecontrol study was carried out in ICUs in a hospital between January 1,2007 and December 31,2008. Cases were patients with A. baumannii infections and controls were those without NI. Conditional Logistic regression analysis was performed to identify independent risk factors.ResultsThe independent risk factors were the number of the underlying diseases（OR=4.03）, duration of nasal feeding tube（OR=11.37）, using respirators（OR=9.83）and acute physiology and chronic health evaluation Ⅱ score system（OR=1.20）;  the protective factor was using vitamin（OR=0.05）.ConclusionImproving patients’ body state and immunity and reducing invasive procedures are helpful for the control and prevention of NI with A. baumannii in  patients in ICUs.
［Key words］intensive care unit；Acinetobacter baumannii；nosocomial infection；risk factors；casecontrol study