RAPIDLY GROWING SPECIES

Question 1

• M. abscessus subsp. abscessus (formerly M. abscessus), M. chelonae, and M. fortuitum

Answer 1

MYCOBACTERIUM CHELONAE– MYCOBACTERIUM ABSCESSUS GROUP

Question 2

been associated with a variety of infections of the skin, lungs, bone, central nervous system, and prosthetic heart valves

Answer 2

• M. chelonae

Question 3

seen in patients with cystic fibrosis (CF)

Answer 3

• M. abscessus

Question 4

important reservoir

Answer 4

• tap water

Question 5

• positive 3-day arylsulfatase test, no reduction of nitrate, and growth on MacConkey agar without crystal violet

Question 6

MYCOBACTERIUM FORTUITUM GROUP

Answer 6

• M. fortuitum, M. peregrinum, and an unnamed third species.

Question 7

• Isolated from water, soil, and dust

Answer 7

MYCOBACTERIUM FORTUITUM GROUP

Question 8

• Associated with localized cutaneous infections

Answer 8

MYCOBACTERIUM FORTUITUM GROUP

Question 9

• Middlebrook 7H11 agars after 1 to 2 days of incubation colonies with branching

Answer 9

MYCOBACTERIUM FORTUITUM GROUP

Question 10

• Filamentous extensions and rough colonies with short aerial hyphae

Answer 10

MYCOBACTERIUM FORTUITUM GROUP

Question 11

• Pleomorphic, ranging from long and tapered to short, thick rods partially acid-fast

Answer 11

MYCOBACTERIUM FORTUITUM GROUP

Question 12

• Positive 3-day arylsulfatase test and
  reduction of nitrate

Answer 12

MYCOBACTERIUM FORTUITUM GROUP

Question 13

M. smegmatis and M. goodie.

Answer 13

MYCOBACTERIUM SMEGMATIS GROUP

Question 14

been implicated in rare cases of pulmonary, skin, soft tissue, and bone infections.

Answer 14

• M. smegmatis

Question 15

• Colonies appearing on egg medium after 2 to 4 days are usually rough, wrinkled, or coarsely folded; smooth, glistening, butyrous colonies may also be seen

Answer 15

MYCOBACTERIUM SMEGMATIS GROUP

Question 16

• Cells are long and tapered or short rods with irregular acid fastness. Occasionally rods are curved with branching or Y-shaped forms; swollen, with deeper staining, beaded, or ovoid forms are sometimes seen.

Answer 16

MYCOBACTERIUM SMEGMATIS GROUP

Question 17

• Negative arylsulfatase reaction, positive iron uptake, ability to reduce nitrate, and growth in the presence of 5% NaCl and on MacConkey agar without crystal violet

Answer 17

MYCOBACTERIUM SMEGMATIS GROUP

Question 18

• Causative agent of Hansen disease (leprosy), an infection of the skin, mucous membranes, and peripheral nerves

Answer 18

MYCOBACTERIUM LEPRAE

Question 19

• The two major forms of the disease OF Mycobacterium leprae

Answer 19

tuberculoid leprosy (localized & benign) and
lepromatous leprosy (disseminated & malignant)

Question 20

include skin lesions and nerve involvement that can produce areas with loss of sensation.

Answer 20

• Symptoms of tuberculoid leprosy

Question 21

if untreated, life-threatening

Answer 21

• Patients with lepromatous leprosy

Question 22

o It is characterized by skin lesions and progressive, symmetric nerve damage.
o Lesions of the mucous membranes of the nose may lead to destruction of the cartilaginous septum, resulting in nasal and facial deformities

Answer 22

lepromatous leprosy