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3 Cards in this Set

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Which of the following mycobacterium spp. is a yellow pigment producer when exposed to light?
A. Xenophi
B. Gordonae
C. Fortuitum
D. Avium-intracellulare
E. Marinum
E. M. Marinum is a photochromagen (Runyon group I).
Xenophi - Group III - non-photochromagen
Fortuitum- Group IV - Rapid grower
Avium-intracellulare - Group III
Gordonae - Group II - Scotochromogen
This LJ medium shows organism before and after light exposure, name the organism?
A. M. Kansasii
B. M. Scrofulaceum
C. M. Haemophilium
D. M. Chelonei
E. MAI
A. M. Kansasii, M. Marinum and M. simiae are the main photochromogens. M szulgai is a photo chromogen only at 22 degrees. Scrofulaceum = Runyon 2, Haemophilium = Runyon 3, Chelonei = Runyon 4, MAI = Runyon 3
Mycobacterium that grows in 6 days and is nitrate reductase positive?
A. M. Fortuitum
B. M. Chelonei
C. M. Tuberculosis
D. M. Marinum
M. Fortuitum and M. Chelonei are both Rapid growers. M. Fortuitum is nitrate test positive while M. Chelonei is nitrate test negative.