From a sputum specimen, an acid-fast bacillus grows on Lowen…
From a sputum specimen, an acid-fast bacillus grows on Lowenstein-Jensen medium within 18 days at 35 degrees. Initially, the colonies are buff, raised and rough when grown in the dark. After exposure to light, no change in pigmentation is detectable. On examination under 10x magnification and on stain, serpentine cording is observed, which demonstrates that this organism produces “Cording Factor”. Which of the following characteristics would confirm the identity of the most likely etiologic agent?
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