Acute enteritis with sepsis: Laboratory Identification

Ungraded Practice Question

The gram stain shown in the photograph was prepared from a positive anaerobic blood culture bottle after 36 hours incubation. Based on the morphology of the bacterial cells (some with spores--blue arrows), the most likely identification is:

Please select the single best answer

Clostridium perfringens
Clostridium septicum
Bacillus cereus
Bacteroides fragilis

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