Case description: Lachnoanaerobaculum gingivalis is an obligate anaerobe identified in a human dental plaque in 2019. Here, we report the first case of L. gingivalis bacteremia in a patient with oral mucositis during chemotherapy. L. gingivalis was confirmed by 16S rRNA gene analysis but not by MALDI-TOF-MS. Conclusion: During chemotherapy in patients with oral mucositis, we should consider the possibility of L. gingivalis bacteremia.
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