Urinary tract infections due to Staphylococcus saprophyticus biotype 3

Area of Science:

• Urology
• Microbiology
• Infectious Diseases

Background:

• Staphylococcus saprophyticus is a common cause of urinary tract infections (UTIs) in women.
• It often presents with symptoms similar to Escherichia coli infections.
• Canadian labs rarely differentiate S. saprophyticus from S. epidermidis.

Purpose of the Study:

• To evaluate the clinical utility of differentiating S. saprophyticus from other coagulase-negative Micrococcaceae.
• To assess the effectiveness of novobiocin resistance as a differentiating marker.

Main Methods:

• Urinary isolates were tested for novobiocin resistance using disc susceptibility tests.
• Prevalence of novobiocin-resistant organisms was compared between York, England, and Vancouver, Canada.
• Pyuria levels were compared between infections caused by different bacterial types.

Main Results:

• Novobiocin resistance reliably identified S. saprophyticus in 3.4% of cases.
• Novobiocin-resistant organisms caused 6.6% (York) and 6.9% (Vancouver) of UTIs in young women.
• These organisms were associated with significantly greater pyuria in York.

Conclusions:

• Novobiocin resistance is a useful marker for identifying S. saprophyticus.
• Differentiating S. saprophyticus offers valuable clinical information for primary care.
• This distinction aids in understanding UTI causes and severity in women.