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The Journal of the Japanese Society for Clinical Microbiology

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[Vol.35 No.1 contents]
Japanese / English

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Article in Japanese

ArticleTitle A case of infective endocarditis caused by Lactococcus petauri identified via whole genome analysis
Language J
AuthorList Marina Suzuki1), Akira Okamoto2), Saori Muto3), Takuya Adachi4), Masayuki Imajoh5), Masanori Daibata6)
Affiliation 1) Department of Clinical Laboratory, Tokyo Metropolitan Toshima Hospital
2) Department of School Health Sciences, Aichi University of Education
3) Department of Clinical Laboratory, Tokyo Metropolitan Hiroo Hospital
4) Department of Infectious Diseases, Tokyo Metropolitan Toshima Hospital
5) Aquaculture Course, Department of Marine Resource Science, Faculty of Agriculture and Marine Science, Kochi University
6) Department of Microbiology and Infection, Kochi Medical School, Kochi University
Publication J.J.C.M.: 35 (1), 21-26, 2024
Received June 17, 2024
Accepted August 30, 2024
Abstract We report here the first case of infective endocarditis caused by Lactococcus petauri in Japan. The patient was a woman in her 80s with a history of mitral valve stenosis and regurgitation, aortic valve regurgitation, and diastolic heart failure. She was admitted for investigation and heart failure treatment. The day after admission, she developed a fever, and two phenotypes of Lactococcus garvieae were detected in her blood cultures. Transthoracic echocardiography revealed the presence of vegetation, and the patient was diagnosed with infective endocarditis caused by L. garvieae. During treatment, the patient developed a cerebral hemorrhage and died. A subsequent whole genome analysis identified both blood culture isolates as L. petauri. As L. petauri exhibits phenotypic and biochemical characteristics similar to those of L. garvieae, whole genome analysis could be useful for distinguishing between them.
Keywords Lactococcus petauri, Lactococcus garvieae
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