On a randomized sample of 305 diabetic patients and of 479 controls was studied for an epidemiological research about the colonization of urinary tract by Group B-Streptococci (GBS). The detection rate was 16.44% in the diabetics, and 8.77% in the controls. and it was higher in diabetic women than diabetic men (R.P. 1.96, p < 0.05). The age, the model of diabetes treatment, and the metabolic control of diabetic people didn't be significatively correlated with GBS presence. Most of GBS that have been identified in diabetic patients were belonged to the sierotype I, whereas in the controls were belonged to the sierotype III.