Staphylococcus warneri: Skin Commensal and a Rare Cause of Urinary Tract Infection

Area of Science:

• Microbiology
• Infectious Diseases
• Clinical Medicine

Background:

• Coagulase-negative Staphylococci (CoNS) are common skin flora, but identifying clinically significant infections can be challenging.
• Risk factors for CoNS infections include prosthetic devices, catheters, and immunocompromised states.
• Staphylococcus warneri is a rare cause of Staphylococcal skin flora, typically comprising less than 1%.

Observation:

• A case of symptomatic urinary tract infection (UTI) caused by Staphylococcus warneri in a 65-year-old male liver cirrhosis patient is presented.
• The patient had a clinically significant and symptomatic UTI.
• Staphylococcus warneri, usually a minor component of skin flora, was identified as the causative agent.

Findings:

• Successful treatment of the Staphylococcus warneri UTI was achieved using fluoroquinolone antibiotics.
• Treatment was guided by culture and sensitivity results.
• The patient's liver cirrhosis was a contributing factor to his immunocompromised state.

Implications:

• This case highlights the potential for Staphylococcus warneri to cause serious, symptomatic infections.
• Culture-directed antibiotic therapy is essential for managing infections caused by less common CoNS species.
• Understanding the pathogenic potential of rare CoNS is critical for effective clinical management and infection control.