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A Case of Native Valve Infective Endocarditis Caused by Bacillus cereus
Dong Hyun Oh1, Min Hyung Kim1, Yong Chan Kim1, Je Eun Song1, Jin Young Ahn1, Sang Hoon Han1, 2, Jun Yong Choi1, 2, Chang Oh Kim1, 2, Hyuk-Jae Chang1, 3, Dongeun Yong4, Young Goo Song1, 2, Kyungwon Lee4, and June Myung Kim1, 2
Department of 1Internal Medicine, 2AIDS Research Institute, 3Cardiovascular Hospital, 4Laboratory Medicine and Research Institute of Bacterial Resistance, Yonsei University College of Medicine, Seoul, Korea
Vol.44 Num.4 (p310~314)
Bacillus cereus is a ubiquitous organism that often contaminates microbiological cultures but rarely causes serious infections in humans. It is the causative organism of infective endocarditis (IE), a disease typically associated with intravenous (IV) drug abusers. Thus, almost all reported cases have involved the tricuspid valve. We report a case of native mitral valve (MV) IE caused by B. cereus in a 54 year-oldman with moderate MV regurgitation but no apparent history of IV drug use. He presented with fever and dyspnea on exertion, symptoms which had been ongoing for 2 months. B. cereus infection was determined by blood culture examination. A transthoracic echocardiography revealed that mobile vegetations had attached to the MV. He was treated with IV antibiotics for a total of 6 weeks and received MV replacement surgery. He has maintained a good clinical recovery without complications since discharge.
Keywords : Infective endocarditis, Bacillus cereus , Native valve, Mitral valve, Nonintravenous drug abuser