Which pathogens cause urinary tract infection (UTI) during pregnancy?

Updated: Aug 17, 2021
  • Author: Raisa O Platte, MD, PhD; Chief Editor: Edward David Kim, MD, FACS  more...
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Answer

E coli is the most common cause of urinary tract infection (UTI), accounting for approximately 80-90% of cases. It originates from fecal flora colonizing the periurethral area, causing an ascending infection. Other pathogens include the following [2] :

  • Klebsiella pneumoniae (5%)
  • Proteus mirabilis (5%)
  • Enterobacter species (3%)
  • Staphylococcus saprophyticus (2%)
  • Group B beta-hemolytic Streptococcus (GBS; 1%)
  • Proteus species (2%)

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