L8 - Gram Positive Rods (pt. 3)

Question 1

McFadyean staining reaction is used for detecting

A. LPS of anthrax bacilli

B. Capsule of anthrax bacilli

C. Fimbriae of anthrax bacilli

D. Endospore of anthrax bacilli

Answer 1

B. Capsule of anthrax bacilli

Question 2

In avirulent forms of Bacillus anthracis presence of toxin is essential for generating protective immune response.

A. True B. False

Answer 2

True

Note: Toxin is needed to generate immune response

Question 3

Anthrax is a contagious disease

True or False?

Answer 3

False

Question 4

Which of the following statement is incorrect regarding antimicrobial susceptibility testing?

A. MIC can be accurately measured in Disk diffusion test (Kirby Bauer tests)

B. MIC is the lowest concentration of antimicrobial agent that can inhibit the growth of bacteria.

C. Published break points are required for interpretation of AST results

D. MIC can be measured in E-test

Answer 4

Answer: MIC can be accurately measured in Disk diffusion test (Kirby Bauer tests)

Question 5

Toxin and capsule are required for the virulence of Bacillus anthracis. T/F

Answer 5

Answer: True

It needs both to become virulent

Question 6

Capsule of Anthrax bacilli is composed of a polysaccharide. T/F

Answer 6

Answer: False

Note: It is composed of Polymers of D glutamic acid (this is one exception)

Question 7

This pig will most likely have an infection caused by:

A. Erysipelothrix rhusiopathiae

B. Listeria monocytogenes

C. Staphylococcus hyicus

D. Streptococcus suis

Answer 7

C. Staphylococcus hyicus

Exudative dermatitis