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Klebsiella pneumoniae
9%
34/392
Staphylococcus saprophyticus
46%
180/392
Proteus mirabilis
20%
79/392
Escherichia coli
19%
73/392
Serratia marcescens
2%
6/392
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This patient presents with a urinary tract infection (UTI). The most common nitrite-negative organism causing UTIs in sexually active women is Staphylococcus saprophyticus. Urinary tract infections are infections affecting either the lower or upper urinary tract. S. saprophyticus is the second most common organism causing UTIs in sexually active women. Diagnostic markers for UTIs on urine dipstick include positive leukocyte esterase, which indicates a bacterial infection (presence of white blood cells), positive nitrates which indicate infection with gram-negative bacteria (E. coli, K. pneumoniae, and P. mirabilis ), and positive urease which indicates the presence of a urease-producing organism such as S. saprophyticus, Proteus, and Klebsiella. Note that in infection with S. saprophyticus, nitrites would be negative as this is a gram-positive organism. Incorrect Answers: Answer 1: K. pneumoniae, P. mirabilis, and E. coli are gram-negative bacteria and would be expected to produce nitrites. Answer 5: S. marcescens does cause UTIs but is typically nosocomial and is not as common as E. coli, S. saprophyticus, or Klebsiella.
3.7
(14)
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