<prompt> A 25-year-old primigravida with 20 weeks of pregnancy has a first episode of a symptomatic bacteriuria. The risk of having pyelonephritis is:No risk with first episode51525  <response>: Ans. is d, i.e. 25Ref. Dutta Obs. 7e, p 299Twenty-five percent of these women are likely to develop acute pyelonephritis, usually in third trimester, if left untreated. 