PMC5700152_01
Gram staining of the anaerobic blood culture after 120 hours of incubation (x1,000). (arrow): spiral-shaped gram-negative bacilli (Brachyspira pilosicoli). (short arrow): gram-negative short bacilli (Butyricimonas virosa).
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F1
The other anaerobic blood culture specimen revealed positivity for gram-negative short bacilli and gram-negative spiral-shaped bacilli after 120 hours, which were identified by direct Gram staining (Fig. 1).