A sputum culture from a patient in Texas has colonies that grow buff colored colonies in approximately 4 weeks.After exposure to light, the colonies turn intense yellow.This isolate is most likely:

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Mycobacterium kansasii is second to MAC as the cause of NTM lung disease.In the United States, most cases of M.kansasii infections have been reported from the southern states of Texas, Louisiana, and Florida; from Illinois and Missouri in the Midwest; and from California.Colonies are photochromogenic, meaning that they form a pigment when exposed to light but are nonpigmented in the dark.

A Sputum Culture from a Patient in Texas Has Colonies