The most common photochromogenic Mycobacterium isolated in the United States is

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Multiple Choice

The most common photochromogenic Mycobacterium isolated in the United States is

Explanation:
Photochromogenic mycobacteria produce pigment when they are exposed to light. Among these pigment-producing species, Mycobacterium kansasii is the most commonly isolated in the United States. It grows slowly and develops a yellow to golden pigment after light exposure, which helps distinguish it from other NTM. In contrast, the nonchromogenic M. tuberculosis does not change color with light, and scotochromogens like M. xenopi produce pigment even in the dark. M. bovis is typically nonchromogenic. So the most common photochromogen seen in US clinical isolates is Mycobacterium kansasii.

Photochromogenic mycobacteria produce pigment when they are exposed to light. Among these pigment-producing species, Mycobacterium kansasii is the most commonly isolated in the United States. It grows slowly and develops a yellow to golden pigment after light exposure, which helps distinguish it from other NTM. In contrast, the nonchromogenic M. tuberculosis does not change color with light, and scotochromogens like M. xenopi produce pigment even in the dark. M. bovis is typically nonchromogenic. So the most common photochromogen seen in US clinical isolates is Mycobacterium kansasii.

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