Mycobacteria

Question 1

What is the name of the media that mycobacteria grow on it

Answer 1

A. Lowenstein-Jensen :

Question 2

Which mycobacteria species give nitrate pos

Answer 2

M.tuberculosis & M.kansasii pos

Question 3

the only mycobacteria able to grow on MAC in 5 days

Answer 3

M.fortuitum & M.Chelonei

Question 4

• Niacin pos
• Nitrate pos
• NAP ssceptible
• Colonies on LJ medium appear nonpigmented (tan / buff) dry , heaped and granular in 14-21 days at 37

Answer 4

Mycobacterium tuberculosis :

Question 5

Agent of Hansen disease & Can not grow on artificial media

Answer 5

M.leprae

Question 6

• Responsible for producing pulmonary infection primarily in cattle & occasionally in humans
• Nonchromogen
• Nitrate neg
• Niacin neg
Sensitive to T2H

Answer 6

M.bovis

Question 7

M.gordonae is slowely grower and …….. (photoreactivity) :

Answer 7

scotochrmogen

Question 8

M.scrofulaceum :
• Slow grower …….

Answer 8

scotochromogen

Question 9

The species of Mycobacterium that would be most commonly associated with contamination of the hot water system in large institutions such as hospitals is
A. M. haemophilum B. M. marinum
C. M. ulcerans
D. M. xenopi

Answer 9

D

Question 10

Mycobacterium fortuitum, a rapidly growing Mycobacterium, grows on MacConkey agar in 5 days. Which other species of Mycobacterium is able to demonstrate growth within the same time period on MacConkey agar?
A. M. bovis
B. M. chelonei
C. M. kansasii
D. M. tuberculosis

Answer 10

B

Question 11

Aslowlygrowing,orange-pigmented, acid-fast bacillus was isolated from a cervical lymph node of a child with symptoms of cervical adenitis. The most likely etiologic agent in this case would be
A. Mycobacterium avium-intracellulare
complex
B. Mycobacterium chelonei
C. Mycobacterium fortuitum
D. Mycobacterium scrofulaceum

Answer 11

D

Question 12

Which of the following is not characteris- tic of Mycobacterium kansasii?
A. Slow growing
B. Obligate aerobe
C. Nonchromogenic
D. Infectionsusuallyacquiredby
respiratory route

Answer 12

C

Question 13

Which one of the following drugs is not considered as primary antimycobacterial therapy?
A. Isoniazid
B. Kanamycin
C. Rifampin
D. Pyrazinamide

Answer 13

B

Question 14

Which one of the following tests would be appropriate in the diagnosis of a mycobac- terial infection?
A. Elektest
B. CAMPtest
C. Naglertest
D. PPDtest

Answer 14

D

Question 15

The Mycobacterium that is the etiologic agent of “swimming pool granuloma” is
A. M.fortuitum
B. M. kansasii
C. M. marinum
D. M. xenopi

Answer 15

C

Question 16

Susceptibilitytothiophene-2-carboxylic acid hydrazide (T2H) is characteristic of which of the following mycobacteria?
A. M. avium-intracellularae complex
B. M. bovis
C. M. kansasii
D. M. tuberculosis

Answer 16

B

Question 17

Which of the following Mycobacterium is most noted for being associated with patients with acquired immunodeficiency syndrome?
A. M. avium-intmcellularae complex
B. M. marinum
C. M. kansasii
D. M. bovis

Answer 17

A

Question 18

The most common photochromogenic Mycobacterium isolated in the U.S. is
A. M. bovis
B. M. kansasii
C. M. tuberculosis
D. M. xenopi

Answer 18

B

Question 19

Which of the following Mycobacterium produces an orange pigment and is most commonly recovered from water?
A. M. intracellulare
B. M. gordonae
C. M. asiaticum
D. M. kansasii

Answer 19

B

Question 20

Which of the following is not true of Mycobacterium leprae?
A. Causes Hansen disease
B. Difficult to grow in vitro
C. Easily transmitted from person to person
D. Usually grows inperipheral limbs of infected patients infected patients

Answer 20

C