[Endocarditis due to Coxiella burnetti despite the absence of obvious exposure]

Area of Science:

• Infectious Diseases
• Bacteriology
• Cardiology

Background:

• Q fever is a zoonotic illness caused by Coxiella burnetii, an intracellular Gram-negative bacterium.
• The disease can manifest acutely or chronically, with endocarditis being a less common but severe complication.
• Coxiella burnetii endocarditis accounts for 1-5% of all infectious endocarditis cases.

Observation:

• A 41-year-old male patient presented with symptoms suggestive of endocarditis.
• The patient had no apparent history of exposure to Coxiella burnetii.
• Diagnostic workup confirmed Q fever endocarditis.

Findings:

• The case underscores that Q fever endocarditis can develop in individuals without identifiable exposure routes.
• This presentation challenges typical epidemiological assumptions for Q fever.
• The diagnosis was confirmed despite the absence of a clear zoonotic link.

Implications:

• Clinicians should maintain a high index of suspicion for Q fever endocarditis, even in atypical cases.
• Further research may be needed to understand non-traditional transmission or exposure pathways.
• Early diagnosis and treatment are crucial for managing Q fever endocarditis and preventing complications.