What is the prevalence of acute pyelonephritis in pregnant women and infants and children?

Updated: Jul 01, 2021
  • Author: Tibor Fulop, MD, PhD, FACP, FASN; Chief Editor: Vecihi Batuman, MD, FASN  more...
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Acute pyelonephritis develops in 20-30% of pregnant women with untreated asymptomatic bacteriuria (ABU) (2-9.5%), most often during the late second and early third trimesters. The incidence of pyelonephritis in infants and children is difficult to ascertain because of the infrequency of typical symptoms. Up to 25% of children with UTI and no signs or symptoms of pyelonephritis do have bacteria demonstrable in the upper urinary tract.

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