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Published on: April 7, 2015
A case of culture-negative endocarditis due to Streptococcus tigurinus
Hajime Kanamori1, Risako Kakuta2, Hisakazu Yano3
1Department of Infection Control and Laboratory Diagnostics, Internal Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan; Division of Infectious Diseases, University of North Carolina School of Medicine, Chapel Hill, USA.
Abstract:
Culture-negative endocarditis remains a diagnostic and therapeutic challenge despite recent medical advances. Streptococcus tigurinus, a novel member of the Streptococcus mitis group, was first identified in Zurich. S. tigurinus possesses virulence determinants and causes invasive infections. We report a case of culture-negative endocarditis with serious complications due to S. tigurinus, which was identified by 16S ribosomal RNA gene sequence analysis of excised valve tissue specimens. This technique is useful for identification of the causative microorganism in patients with culture-negative endocarditis and may facilitate early diagnosis and appropriate antimicrobial treatment.
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