Mycobacterium

Question 1

ph requirements for mycobacterium spp

Answer 1

ph 6.5 to 6.8

Question 2

True or false
extreme high lipid content of mycobacterium spp is due to the cord factor wax D and mycolic acid

Answer 2

True

Question 3

target site of acid fast staining

Answer 3

mycolic acid

Question 4

True or false
all mycobacterium are strictly aerobic

Answer 4

true

Question 5

this occurs when cellular immunity is suppressed

Answer 5

reactivation

Question 6

True or false
Mycobacterium tuberculosis grows within 4 weeks on Lowenstein jensen and 14 days on middlebrook 7h10 7h11

Answer 6

False
2 to 3 weeks in Lowenstein
5 to 10 days in 7h10 7h11

Question 7

True or false
antigen and hypersensitivity are high in tubercles

Answer 7

false
low antigen high hypersensitivity

Question 8

True or false
antigen and hypersensitivity are low in caseation

Answer 8

false
antigen and hypersensitivity are high in caseation

Question 9

mycobacterium spp that cannot be cultured

Answer 9

mycobacterium leprae

Question 10

type of meningitis that is due to exposure to pigeon feces

Answer 10

fungal tb meningitis

Question 11

mycobacterium spp from infected cattle that causes primary tuberculosis

Answer 11

mycobacterium bovis

Question 12

Runyon classification of NTM that is non pigmented produces white to tan when exposed to light or dark

Answer 12

Nonphotochromogens Group 3

Question 13

Runyon classification of NTM that is pigmented produces orange to yellow when exposed to light or dark

Answer 13

Scotochromogen Group 2

Question 14

Runyon classification of NTM that is pigmented produces orange to yellow when exposed to light

Answer 14

Photochromogen Group 1

Question 15

mycobacterium that is a rare pulmonary infection

Answer 15

mycobacterium asiaticum

Question 16

All of the statement are true, except

1. Mycobacterium kansassi is known as yellow bacillus and is also the 3rd most common NTM
2. Mycobacterium ulcerans causes buruli ulcers and is also the 2nd most common NTM
3. Mycobacterium avium complex is the most isolated NTM and it is a combination of 2 mycobacterium

Answer 16

1 and 2

M kansassi is the 2nd most common while M.ulcerans is the 3rd most common

Question 17

mycobacterium spp that causes Hodgkin’s lymphoma

Answer 17

mycobacterium haemophilum

Question 18

Which of the statement is true

1. dithioreitol and zephiran acts as digestant for mycobacterium specimen
2. trisodium phosphate and 2 to 4% NaOH acts as digestants

Answer 18

2
zephiran is a decontaminating agent

Question 19

report the following afb result
1-9/ 10 fields

Answer 19

2+

Question 20

report the following afb result
1-9/ 100 fields

Answer 20

1+

Question 21

report the following afb result
1-2/300 fields

Answer 21

repeat test

Question 22

report the following afb result
>36 per field

Answer 22

4+

Question 23

drug of choice for M.leprae

Answer 23

dapsone, clofazimine, rifampin

Question 24

True or false
Mycobacterium tuberculosis is resistant in T2H test while Mycobacterium bovis is susceptible

Answer 24

True

Question 25

test for the ability of mycobacterium to convert ferric ammonium citrate to iron oxide.
What is the positive result

Answer 25

iron uptake; rusty brown color