Mycobacterium

Question 1

slender, slightly curved or straight, rod-shaped organisms 0.2 to 0.6
μm × 1 to 10 μm in size.

Answer 1

mycobacteria

Question 2

take up dye with increased staining time or application of heat but resist
decolorization with acid-ethanol

Answer 2

Mycobacteria

Question 3

They are nonmotile and do not form spores.

Answer 3

mycobacteria

Question 3

TB is one of the oldest documented communicable diseases

Answer 3

M.tuber

Question 4

TB is one of the oldest documented communicable diseases

Answer 4

M.tuber

Question 5

Biochemically, It is characteristically positive for niacin accumulation, reduction of nitrate
to nitrite, and production of catalase

Answer 5

M.tuber

Question 6

produces TB primarily in cattle but also in other ruminants, as well
as in dogs, cats, swine, parrots, and humans.

Answer 6

M.bovis

Question 7

These organisms are common environmental saprophytes and have been
recovered from soil, water, house dust, and other environmental sources.

Answer 7

Mycobacterium avium and Mycobacterium intracellulare

Question 8

It is the causative agent of Johne disease, an intestinal infection occurring as a
chronic diarrhea in cattle, sheep, goats, and other ruminants

Answer 8

Mycobacterium avium subsp. Paratuberculosis

Question 9

o It is the cause of disseminated infections in patients with AIDS

Answer 9

Mycobacterium genavense

Question 9

o It second to MAC as the cause of Nontuberculous Mycobacteria
o The most common manifestation is chronic pulmonary disease involving the
upper lobes, usually with evidence of cavitation and scarring

Answer 9

Mycobacterium kansasii

Question 10

It occurs primarily in patients who are immunocompromised.
o Submandibular lymphadenitis, subcutaneous nodules, painful swellings, ulcers
progressing to abscesses, and draining fistulas are often the clinical
manifestations

Answer 10

Mycobacterium haemophilum

Question 11

Cutaneous infections in humans occur when traumatized skin comes into contact
with salt water or inadequately chlorinated fresh water containing the organism

Answer 11

Mycobacterium marinu

Question 11

appears as a short coccobacillus without cross bands on acidfast–stained smears

Answer 11

Mycobacterium malmoense

Question 12

o Causes cervical lymphadenitis in children.

Answer 12

Mycobacterium scrofulaceum

Question 13

o Original strains were isolated from the lymph nodes of monkeys

Answer 13

Mycobacterium simiae

Question 14

o The most common manifestation is pulmonary disease similar to TB

Answer 14

Mycobacterium szulgal

Question 15

o It is a rare cause of mycobacteriosis, also referred to as Buruli ulcer

Answer 15

Mycobacterium ulcerans

Question 16

is the causative agent of Hansen disease, an infection of the skin,
mucous membranes, and peripheral nerves

Answer 16

Mycobacterium leprae

Question 17

o It has been recovered from hot and cold water taps and birds

Answer 17

Mycobacterium xenopi

Question 18

s the species of rapidly growing mycobacteria most likely isolated
from disseminated cutaneous infections in immunocompromised patients

Answer 18

M. chelonae