My father is chronic diabates and 78. For the past 5 years he is suffering from UTI mainly from Klebsiella derivatives but in most cases assymptomatic. As per doctors advices almost all anti-biotics consumed. 6 months ago done cystoscopy found no lession,no other growth in UB or prostate. PSA level normal. Kidney functioning normal Na,K,Ura all normal,. Blood sugar level maintains in 70-120 range. No fever ,shivering. For the last 5 months not on any antibiotic. We chech Urine for culture/sensitivity for the last 5 months one time in amonth. All time Klebsiella grown 100000 col.count but patient is assymptomatic. What we shall do?