80 Prevalance of Urinary Tract Infection in Patients Attending Imam Khomeini Hospital, Sari, 2010-2011 Mohammad Ahanjan 1 , Mohammad Reza Haghshenas 1 , Farshad Naghshvar 2 , Elham Bairamvand 3 1 Department of Microbiology, Molecular and Cellular Biology Research Center, Faculty of Medicine, Mazandaran University of Medical Sciences, Sari, Iran 2 Department of Pathology, Molecular and Cellular Biology Research Center, Faculty of Medicine, Mazandaran University of Medical Sciences, Sari, Iran 3 MSc Student in Microbiology, Student Research Committee, Faculty of Medicine, Mazandaran University of Medical Sciences, Sari, Iran (Received January 17, 2012 ; Accepted February 23, 2013) Abstract Background and purpose: Urinary tract infection (UTI) is one of the most common infections that almost 10 perecent of people might experience it once in a lifetime. UTI is common among both sexes but is usually more prevalent among female.This study aimed at recocnizing the organisms causing UTI in Imam Khomeini hospital, Sari. Materials and methods: In this descriptive analytical study, we used the urine samples of 2100 patients attending Imam Khomeini Hospital in Sari. The samples were cultured on blood agar and McConky, and biochemical tests were also done. Moreover, urin sedimnents were analyzed after being centrifuged. After 24 hr inacubation in 37°C, gram staining was done on colonies. Then antibiogram test was carried out using disk diffusion. Patients’ information (age, sex, etc.) was also recorded. Results: A total of 2100 suspisious cases were studied of whom 525 were detected with UTI. They were 39% male and 61% female. The most prevalent bacteria were E.coli (41.9%), Staphylococcus saprophyticus (24.9%), Pseudomonas aeruginosa (14%), and Klebsiella pneumonia (8.95%). Most of the isolated bacteria were resistant to Trimethoprim sulfamethoxazole but the least rate of resistance was seen with Amikacin. Conclusion: Antibiotic resistance was observed in a different pattern in patients with UTI. Hence, further reseach should be done to investigate the bacterial resistance to antibiotics. Keywords: UTI, Imam Khomeini Hospital, Mazandaran J Mazand Univ Med Sci 2013; 23(Supple 1): 82-86 (Persian).