Ruminococcus gnavus is frequently found among human gut microbiome. However, human bloodstream infections by R. gnavus have been reported only three times. Clinical details were lacking for one case; the other two cases with concurrent bacteremia in patients with diverticulitis. We report a case of R. gnavus bloodstream infection in a patient with a gall bladder perforation suggesting its association with damage to the gastrointestinal tract. R. gnavus was misidentified using biochemical test but 16S rRNA sequencing and Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry were useful for correct identification. With the advancement of identification method in clinical laboratory, more frequent identification of R. gnavus from clinical specimens is expected.
Keywords: Bacteremia; Gram stain; MALDI-TOF MS; R. gnavus.
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