Pregnancy predisposes women with bacteruria, which in the nonpregnant state is usually self-limiting. Normal pregnancy-related physiologic changes contribute to UTIs and include dilatation of the upper collecting systems, increased urinary tract dead space, increased vesicoureteral reflux, hypotonic renal pelvises, decrease in the natural antibacterial activity in the urine, and a decrease in the phagocytic activity of leukocytes at the mucosal surfaces. UTIs in pregnant women usually do not present with typical symptoms and may be asymptomatic. Pyelonephritis is a serious complication of UTIs.
Source:
http://emedicine.medscape.com/
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