Karius Test Application in Endocarditis Diagnosis

This case study presents the application of the Karius Test in diagnosing endocarditis, particularly in patients with negative blood cultures. The study includes a 29-year-old male with congenital heart disease who underwent multiple cardiac surgeries and was exposed to a Heater-Cooler device linked to a Mycobacterium chimaera outbreak. The Karius Test provided a positive result for C. burnetii within 48 hours, leading to an earlier diagnosis and successful treatment. Additional clinical evidence from various study sites indicates that the Karius Test is as sensitive as blood cultures but offers a longer duration of positivity. In a series of pediatric patients, the Karius Test identified the causative pathogen in 80% of cases where standard testing failed. The document outlines specific considerations for when to use the Karius Test, emphasizing its role in cases of suspected endocarditis, particularly when blood cultures are negative or inconclusive.