PMC9184550_01
Gram stain of Streptobacillus moniliformis. Culture taken from the patient's right knee joint synovial fluid.
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Operative cultures ultimately grew rare gram-negative rods, later identified on Matrix-assisted laser desorption/ionization-time of flight mass spectrometry (MALDI-TOF MS) as Streptobacillus moniliformis (Fig. 1), one of the causative agents of RBF.