Clinical Report: Severe Sepsis Due to MRSA with Pulmonary Abscesses

Overview

This report details a rare case of severe sepsis caused by CA-MRSA in a previously healthy 12-year-old boy, presenting with bilateral pulmonary abscesses and humeral osteomyelitis. The case emphasizes the importance of early diagnosis and multidisciplinary management in complex pediatric infections.

Background

Community-acquired methicillin-resistant Staphylococcus aureus (CA-MRSA) is increasingly recognized as a significant cause of severe infections, particularly in children. While it commonly presents as skin and soft tissue infections, it can lead to serious complications such as bacteremia and metastatic infections. Understanding the clinical manifestations and management strategies for CA-MRSA is crucial for improving patient outcomes.

Data Highlights

Laboratory findings included leukocytosis (WBC 18.9 × 10⁹/L), elevated C-reactive protein (196.2 mg/L), and positive blood cultures for MRSA. Imaging revealed bilateral cavitary pulmonary abscesses and osteomyelitis of the proximal humerus.

Key Findings

• The patient developed severe sepsis after manipulation of a skin furuncle.
• Clinical presentation included high-grade fever, tachycardia, and significant swelling of the left upper limb.
• Laboratory tests indicated leukocytosis and elevated inflammatory markers.
• Imaging confirmed bilateral pulmonary abscesses and osteomyelitis.
• The isolated MRSA strain was resistant to oxacillin and clindamycin but susceptible to vancomycin and linezolid.

Clinical Implications

Timely recognition of CA-MRSA infections and their potential complications is essential for effective management. Clinicians should maintain a high index of suspicion for severe invasive disease in pediatric patients presenting with skin infections, particularly following manipulation of lesions.

Conclusion

This case underscores the critical need for early diagnosis and comprehensive management of CA-MRSA infections to prevent severe complications in pediatric patients.

References

1. Surviving Sepsis Campaign, SCCM, 2026 -- International Guidelines for the Management of Septic Shock and Sepsis-Associated Organ Dysfunction in Children
2. IDSA/PIDS, 2026 -- Guidelines for the Management of Community-Acquired Pneumonia (CAP) in Infants and Children Older Than 3 Months of Age
3. PIDS/IDSA -- Guideline on Diagnosis and Management of Acute Hematogenous Osteomyelitis in Pediatrics
4. Infection — Multidrug-resistant Streptococcus pneumoniae serotype 15A as a Cause of Hospital-acquired Pneumonia
5. Infection — Effective Treatment of a Newborn with Nosocomial Pneumonia Caused by Stenotrophomonas maltophilia Using Cefiderocol
6. Infection — A Comprehensive Review of Eosinophilic Pneumonia Associated with Daptomycin: Literature and Case Series Analysis
7. Evaluating the Transmission Risk of an Asymptomatic COVID-19 Case in Orthopaedic Surgical Settings
8. Surviving Sepsis Campaign International Guidelines for the Management of Septic Shock and Sepsis-Associated Organ Dysfunction in Children | SCCM
9. IDSA/PIDS 2026 Guidelines for the Management of Community-Acquired Pneumonia (CAP) in Infants and Children Older Than 3 Months of Age
10. PIDS/IDSA Guideline on Diagnosis and Management of Acute Hematogenous Osteomyelitis in Pediatrics