Early Diagnosis and Successful Treatment of Influenza Coinfection With Community-Onset Methicillin-Resistant Staphylococcus aureus Necrotizing Pneumonia: A Case Report.

BACKGROUND: Necrotizing pneumonia is a severe and potentially fatal complication of community-acquired pneumonia, often associated with toxin-producing or drug-resistant pathogens. Rapid and accurate identification of these pathogens is crucial for timely intervention. Polymerase chain reaction (PCR)-based diagnostic tools, such as the BioFire FilmArray pneumonia panel, have significantly improved early pathogen detection, aiding in prompt and targeted treatment as in the presenting case. CASE REPORT: We report a case of necrotizing pneumonia in a female adult who presented with severe respiratory distress. Initial testing identified coinfection with influenza and methicillin-resistant Staphylococcus aureus (MRSA) using the BioFire FilmArray pneumonia panel, which provided rapid and precise pathogen detection before admission. The patient developed worsening respiratory failure, requiring mechanical ventilation and intensive care. Despite the severity of the infection, early diagnosis and appropriate antimicrobial therapy tailored to the identified pathogens led to a significant clinical improvement, allowing for a favorable recovery. CONCLUSION: This case highlights the critical role of rapid molecular diagnostics in the early detection of coinfections in necrotizing pneumonia. The timely identification of influenza and MRSA facilitated targeted antimicrobial therapy, which was instrumental in preventing further complications and improving the patient's prognosis. As PCR-based diagnostics become more widely available, their integration into routine clinical practice can enhance the management of severe pneumonia cases, ultimately leading to better outcomes. Clinicians should maintain a high index of suspicion for coinfections in severe pneumonia and leverage rapid diagnostic tools to guide early and effective treatment strategies.