Objective: Acinetobacter baumannii is clinically important, especially in critically ill patients, due to the infections it may cause. In our study, it was aimed to evaluate the A. baumannii strains which were detected as a healthcare-associated infection agent (HCAI) in a tertiary hospital.

Material and Method: Nine hundred and forty patients hospitalized in the intensive care unit were followed prospectively in terms of HCAIs by active surveillance method. The “Centers for Disease Control and Prevention” (CDC) diagnostic criteria were used for the diagnosis of HCAIs. A total of 947 A. baumannii strains isolated from clinical specimens of patients diagnosed as HCAIs were analyzed retrospectively.

Results: Nine hundred forty-seven A. baumannii strains isolated from the cultures of patients and diagnosed as HCAIs were included in our study. The most common infection of A. Baumannii was lung infection (57.1%). This was followed by soft tissue infection (STI) (28.7%), surgical site infection (SSI) (13.4%), bloodstream infection (BSI) (13.05%) and urinary system infection (UTI) (5%). Considering the distribution of A. Baumannii as causative agent in invasive device related hospital infections, it was considered as responsible in 67% of VAP, 13.2% of central venous catheter related bloodstream infections (CVCR-BSI), 6.1% of catheterrelated urinary system infection (CI-UTI). The units where A. baumannii was found most frequently were ICUs (87%).

Conclusion: By observing the distribution of A. baumannii according to the systems in by the patients which were hospitalized in our hospital, it was found that respiratory tract infections were most common. Determination of resistant A. Baumannii isolates and the risk of cross contamination in the hospital environment is important in terms of evaluating the effectiveness of the control measures being applied and developing more effective methods.