The most common photochromogenic Mycobacterium isolated in the United States is which species?

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Multiple Choice

The most common photochromogenic Mycobacterium isolated in the United States is which species?

Explanation:
Photochromogenic mycobacteria produce pigment only after exposure to light, so their colonies darken to a yellow-to-orange hue when illuminated. Among these pigmented species, the one most frequently isolated in the United States is Mycobacterium kansasii, which commonly causes pulmonary infections and is seen more often in clinical labs than other photochromogens. In contrast, the tuberculosis pathogens M. tuberculosis and M. bovis belong to the M. tuberculosis complex and are not classified as photochromogens, and M. xenopi is less commonly encountered with different growth/pigment patterns. Thus, M. kansasii is the best answer.

Photochromogenic mycobacteria produce pigment only after exposure to light, so their colonies darken to a yellow-to-orange hue when illuminated. Among these pigmented species, the one most frequently isolated in the United States is Mycobacterium kansasii, which commonly causes pulmonary infections and is seen more often in clinical labs than other photochromogens. In contrast, the tuberculosis pathogens M. tuberculosis and M. bovis belong to the M. tuberculosis complex and are not classified as photochromogens, and M. xenopi is less commonly encountered with different growth/pigment patterns. Thus, M. kansasii is the best answer.

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