Bacillus – Section 1

1. McFadyean’s reaction is employed for the presumptive diagnosis of

A. anthrax
B. tetanus
C. typhoid
D. all of these

Correct Answer: A. anthrax

2. The bacteria used to examine the efficacy of autoclave, is

A. B polymyxa
B. B brevis
C. Bacillus stearothermophilus
D. B megaterium

Correct Answer: C. Bacillus stearothermophilus

3. Antibodies to which of the following antigens of Bacillus anthracis are protective?

A. Capsular polypeptide
B. Somatic polysaccharide
C. Anthrax toxin
D. None of these

Correct Answer: C. Anthrax toxin

4. The test(s) which can be used to differentiate anthrax bacilli from anthracoid bacilli is/are

A. presence of medusa-head colony
B. presence of capsule
C. susceptibility to gamma phage
D. all of these

Correct Answer: D. all of these

5. Medusa head appearance of the colonies may be due to

A. Bacillus anthracis
B. Proteus mirabilis
C. Clostridium tetani
D. Pseudomonas aeruginosa

Correct Answer: A. Bacillus anthracis

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