Background: Zinc deficiency can increase the risk of infectious diseases. Given that recurrent urinary tract infection is a common complication, this study examines the association between serum zinc levels and recurrent urinary tract infections. Methods: In this case-control study, serum zinc levels for 48 patients with recurrent urinary tract infections were compared with the serum zinc levels of the same number of people in the control group who were matched in terms of location and age. Using SPSS ver. 18, univariate analysis was performed through t-test, correlation coefficient; and multivariate analysis was carried out through multiple regression tests. Significant level was considered as less than 0.05. Results: There was a weak correlation between age and serum zinc level (r=-0.205, p=0.045). Mean serum zinc level of the test group and the control group were 96.83 (±11.25) and 76.72 (±17.06) microgram/deciliter (p=0.001), respectively. Level of zinc reduced with aging; in addition, the group with recurrent UTIs had lower zinc levels than the control group (p=0.010, R2=0.377). Conclusion: According to the results of this study, serum zinc levels of people with recurrent urinary tract infections were lower than that in the control group. It seems that zinc levels are a risk factor for recurrent urinary tract infections.
Keywords: Micronutrients; Nutrition; Recurrent infections; Urinary tract infection; Zinc.