What organism is commonly found in sexually active females along with E. coli and enterococci?

Staphylococcus saprophyticus is a coagulase-negative staphylococcus that is considered a common uropathogen, particularly in sexually active young women. This organism is known for its ability to cause urinary tract infections (UTIs), often associated with sexual activity.

The presence of Staphylococcus saprophyticus along with E. coli and enterococci in the vaginal and urinary flora of sexually active females is important because it reflects a typical microbial landscape where these organisms can contribute to urinary infections. Its role as a uropathogen is well-documented, making it a relevant factor to consider in cases of UTIs in this demographic.

Other organisms listed, while they may occur, do not have the same level of association specifically with sexually active females as Staphylococcus saprophyticus does. E. coli is indeed a frequent cause of UTIs but is already included in the query, and the other choices like Proteus mirabilis or Klebsiella pneumoniae are less commonly identified in this particular context.