History and Objectives: Because urinary tract infection (UTI) is one of the most common infectious diseases in elderly patients, this study was conducted to identify bacterial infection and antibiotic resistance at Kahrizak nursing home in 1998.

Materials and Methods: A descriptive study was done. Urinary samples were collected and identified by standard bacteriologic methods. Antibiotic resistance was determined. Sex and age of patients were recorded.

Results: Of 487 patients, 34.7% of patients were men and 65.3% were women. 250 patients were under the age of 54 years and 237 patients were above the age of 55 years. 313 patients (64%) had bacteriuria. E.coli was the most common bacteria among two age groups. The other bacteria were Proteus mirabilis, Proteus vulgaris, Klebsiella and Staph.aureus, Alcaligenes and Providencia. All bacteria were resistant to ampicillin (100%), tetracycline (83.5%), cephalothin (81.2%) and co-trimoxazole nitrofurantoin (62.6%).

Conclusion: In the present study, the resistant bacteria to antibiotic was found therefore it is recommended that antibiogram should be done before prescription of other antibiotic. E.coli was the most common bacteria, so, basic personal hygiene to control the infection is recommended.