3.4.3.1 Scotochromogens

Question 1

Also known as Tap water bacillus
Which very rarely implicated in disease

Answer 1

Mycobacterium gordonae

Question 2

A Mycobacterium that can infect extrapulmonary and pulmonary?

Answer 2

M. szulgai

Question 3

MOst unique characteristics of M. szulgai?

Answer 3

Can be photochromogens and scotochromogens

Question 4

In M. szulgai, what is the difference in temp in photo and scotochromogens?

Answer 4

Photo: 22C
Scoto: 37 C

Question 5

Tween 80 pos
Reduce nitrate
Inhibited by 5% NaCl

Answer 5

M. szulgai

Question 6

Mycobacterium that causes Cervical lymphadenitis in Children?

Answer 6

M. scrofulaceum

Question 7

Urease (+)
Catalase (>45mm)
Nitrate (+)
Tween 80 (-)

Answer 7

M. scrofulaceum?

Question 8

Mycobacterium that exhibits Both Scoto and Nonphotochromogens?

Answer 8

M. xenopi

Question 9

In M. xenopi, Can it exhibit pulmonary and extrapulmonary?

Answer 9

YES

Question 10

M. xenopi grows best at what temp?

Answer 10

42 C

Question 11

Where M. xenopi exhibit Bird’s Nest with Nonphotochromogen properties?

Answer 11

Cornmeal agar

Question 12

Heat stable catalase (+)
Anylsulfatase and Pyrazinamidase 9+)
Niacin and Nitrate reduction (-)

Answer 12

M. xenopi