Lab Med Online.  2021 Jan;11(1):69-72. 10.47429/lmo.2021.11.1.69.

A Case of Infective Endocarditis Caused by Kytococcus schroeteri

• Yun J
• Kim TS
• Park H
• Park JH

• KMID: 2525784
• DOI: http://doi.org/10.47429/lmo.2021.11.1.69

Abstract

Kytococcus spp. is a skin bacterial flora that rarely causes human infections.K. schroeteri has been reported to cause infective endocarditis and bloodstream infections in patients with prosthetic valves and leukemia, respectively. In this study, we report a case of infective endocarditis caused by K. schroeteri. A 46-year-old man who underwent valve replacement surgery for aortic dissection 5 months ago was admitted. The patient had intermittent fever, suggestive of infective endocarditis. Gram-positive bacteria were detected in one aerobic blood culture bottle among 3 pairs of blood cultures and identified as Dermacoccus nishinomiyaensis/K. sedentarius by the VITEK ^® 2 system (bioMérieux, USA). However, K. schroeteri was identified by the microflex™ LT biotyper (Bruker Daltonics, Germany; score 2.037), and the sequence of the 16S rRNA showed 99.79% similarity with that of K. schroeteri. The patient received antibiotics, including gentamicin, vancomycin, and rifampin. Four sequential follow-up peripheral blood cultures were negative for microorganisms, and the patient recovered from infective endocarditis. To our knowledge, this is the first reported case of infective endocarditis caused by K. schroeteri in Korea.

Keyword

Kytococcus schroeteri; Bacterial endocarditis; Bacteremia; Mass spectrometry; Matrix-assisted laser desorption-ionization; 16S rRNA gene sequencing

Figure

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  Fig. 1 Microscopic findings of Kytococcus schroeteri showing pairs or tetrads of gram-positive cocci (Gram stain, 1,000×).

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