What Types of Bacteria Cause UTI?

March 30, 2024 | by Yashaswi Pathakamuri | Posted in FAQ's

Urinary tract infections (UTIs)

Urinary tract infections (UTIs) can be caused by various types of bacteria, but the majority of UTIs are caused by bacteria from the gastrointestinal tract, particularly Escherichia coli (E. coli). However, other bacteria can also cause UTIs, including:

  • Staphylococcus saprophyticus: This bacterium is the second most common cause of UTIs, particularly in young sexually active women.
  • Klebsiella pneumoniae: Klebsiella species, including K. pneumoniae, can cause UTIs, especially in individuals with underlying health conditions or those who have undergone urinary tract instrumentation.
  • Proteus mirabilis: Proteus species, including P. mirabilis, can cause UTIs, particularly in individuals with urinary catheters or structural abnormalities of the urinary tract.
  • Enterococcus faecalis: Enterococci are bacteria that commonly inhabit the gastrointestinal tract but can also cause UTIs, especially in individuals with underlying urinary tract abnormalities or who have undergone urinary tract procedures.
  • Streptococcus agalactiae (Group B Streptococcus): Group B Streptococcus can cause UTIs, particularly in pregnant women, where it poses a risk to both the mother and the unborn child.
  • Pseudomonas aeruginosa: Pseudomonas species, including P. aeruginosa, can cause UTIs, particularly in individuals with compromised immune systems or those who have been hospitalized.
  • Other Enterobacteriaceae: Various other bacteria from the Enterobacteriaceae family, such as Citrobacter species, Enterobacter species, and Serratia species, can also cause UTIs, although they are less common than E. coli and some of the other mentioned bacteria.

The choice of antibiotic treatment for UTIs may vary depending on the type of bacteria causing the infection and its susceptibility to different antibiotics. Proper diagnosis and treatment are essential to prevent complications and recurrent infections.

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