Hello and welcome, Vaginal infection do predispose to urine infections. Polyps are vulnerable to get infected. However if there are leuckocytes in urine then this indicates a urine infection. The polyp may have predisposed to it but now the infection is in the urine. The thickened bladder also points in the same direction [ cystitis or bladder infection]. The infection does not always give a positive culture test. For similar patients in my clinic I prefer a dose of antibiotic as there are leukocytes in significant number. Other measures are drink plenty of water to flush bacteria. Kindly discuss with your doctor about the need of antibiotics and get them prescribed if possible as empirical antibiotics can be prescribed on suspicion even if the culture is negative. Hope this satisfies your query. Thanks for using HCM. Feel free to ask any more questions that you may have. Dr Madhuri Bagde Consultant Obstetrician and Gynecologist