Lachnoanaerobaculum spp. is an obligate anaerobic, gram-positive, spore-forming, rod-shaped bacillus. Here, we report the first known case of bacteremia due to L. orale, which was detected in a patient with acute lymphoblastic leukemia. A 69-year-old man developed neutropenic fever with severe stomatitis during chemotherapy for leukemia. The bacteria strain isolated from blood culture was successfully identified as L. orale via matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS). Susceptibility testing revealed that the strains showed low minimum inhibitory concentrations (MICs) of beta-lactams, clindamycin, and metronidazole, but higher MICs of fluoroquinolones. The present case study indicates that Lachnoanaerobaculum can be a cause of human infection, including bloodstream infection.
Keywords: Anaerobe; Bacteremia; Lachnoanaerobaculum orale; MALDI-TOF MS.
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