Treatment of Urinary Tract Infection with Coagulase Negative Staphylococci

Understanding the Clinical Significance

Coagulase-negative staphylococci, particularly S. epidermidis, are commonly found as contaminants or colonizers rather than true pathogens in the urinary tract, especially in patients without symptoms, according to the American Academy of Pediatrics 1
The discrepancy between a negative in-office urine test and a positive PCR test suggests asymptomatic bacteriuria rather than a true infection, as noted by the European Association of Urology 2
Current guidelines specifically note that organisms such as coagulase-negative staphylococci are "not considered clinically relevant urine isolates" in many cases, as stated by the American Academy of Pediatrics 1

Treatment may be warranted in patients with symptoms consistent with UTI, such as dysuria, frequency, urgency, and suprapubic pain, according to the European Association of Urology 3
Treatment should be considered in patients with risk factors, including indwelling urinary catheter, recent urological procedure, immunocompromised status, or pregnancy, as recommended by the European Association of Urology 3 and the Infectious Diseases Society of America 5

First-line treatment options for uncomplicated cystitis include nitrofurantoin for 5 days or TMP/SMX for 3 days, as recommended by the JAMA Network Open 4
For pyelonephritis, a first-generation cephalosporin for 7 days may be used, according to the European Association of Urology 3 and the JAMA Network Open 4
For complicated UTI with systemic symptoms, treatment options include amoxicillin plus an aminoglycoside, a second-generation cephalosporin plus an aminoglycoside, or an intravenous third-generation cephalosporin, as recommended by the European Association of Urology 3

Treatment should be guided by antimicrobial susceptibility testing when available, according to the European Association of Urology 3

The clinical approach algorithm involves assessing for symptoms of UTI, evaluating for complicated vs. uncomplicated UTI, and selecting antimicrobial therapy based on local resistance patterns, patient risk factors, severity of symptoms, and antimicrobial susceptibility results, as recommended by the European Association of Urology 3
Asymptomatic bacteriuria should not be treated, except in pregnancy, to avoid unnecessary antibiotic use and resistance, according to the European Association of Urology 2