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Bacteriology

Bacillus anthracis and Bacillus cereus

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SAMPLE QUESTION

A worker who repairs animal-hide drums develops a small papule on his forearm. Over several days it becomes a vesicle and then an ulcer with a black center. The lesion is painless despite marked surrounding swelling. A specimen contains large gram-positive rods.

Which additional laboratory pattern is most consistent with the organism causing this illness?