Native Valve Infective Endocarditis Caused by Staphylococcus condimenti: First Case Reported.

BACKGROUND

Staphylococcus condimenti is a coagulase-negative staphylococcus previously considered nonpathogenic. We report to our knowledge the first documented case of native-valve infective endocarditis caused by this pathogen.

CASE SUMMARY: A 67-year-old man with rheumatic heart disease presented with fever and purpura. Initial IgA-dominant glomerulonephritis and leukocytoclastic vasculitis suggested systemic vasculitis. However, echocardiography revealed a large mitral vegetation. Scondimenti was identified by MALDI-TOF mass spectrometry and 16S rRNA sequencing from blood cultures and was subsequently confirmed by resected valve culture. After urgent mitral valve replacement and targeted cefazolin, the patient achieved full recovery and resolution of all immune-mediated complications.

DISCUSSION: This report identifies Scondimenti as an emerging pathogen capable of significant valvular destruction and immune-mediated phenomena mimicking systemic vasculitis.

TAKE-HOME MESSAGES: Rare coagulase-negative staphylococci require integrating clinical context and species-level molecular identification to avoid dismissal as contaminants. Emerging pathogens can present with misleading systemic immunological manifestations, requiring high clinical suspicion for infective endocarditis.