Ureaplasma parvum Septic Arthritis, a Clinic Challenge

Area of Science:

• Microbiology
• Infectious Diseases
• Clinical Medicine

Background:

• Ureaplasma parvum is a commensal bacterium of the genital tract.
• Invasive infections are rare but can include septic arthritis and meningitis.
• Immunocompromised patients are at higher risk for invasive Ureaplasma infections.

Observation:

• A 74-year-old woman with follicular lymphoma developed cellulitis and subsequent elbow arthritis.
• Routine bacterial cultures of synovial fluid were negative.
• Ureaplasma parvum was detected in synovial and vaginal fluid using broad-range 16S rRNA gene PCR and targeted PCR.

Findings:

• Multilocus Sequence Typing (MLST) identified the isolates as ST4, a globally prevalent clone.
• Treatment involved surgical intervention and targeted antibiotics (doxycycline, azithromycin).
• Initial clinical improvement in arthritis was observed, despite residual functional impairment.

Implications:

• Ureaplasma arthritis should be considered in culture-negative arthritis, particularly in immunocompromised patients.
• Effective treatment strategies for Ureaplasma arthritis are not fully established but may involve prolonged courses of doxycycline, azithromycin, or fluoroquinolones.
• This case underscores the utility of molecular methods for diagnosing rare microbial infections.