L6 - Gram Positive Rods

Question 1

Which of the following is incorrect about tetracyclines?

A. Act by inhibiting protein synthesis
B. Broad spectrum antimicrobial agent
C. Bactericidal in action
D. Energy dependent efflux is a common mechanism of resistance

Answer 1

Answer: Bactericidal in action

Note: But it can vary depending on dosage concentrations

Question 2

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

A. MIC is the lowest concentration of antimicrobial agent which can inhibit the growth of bacteria
B. Published break point are required for interpretation of AST results.
C. MIC can be measure in E-test
D. MIC can be accurately measured in Disk diffusion test (Kirby Bauer tests)

Answer 2

Answer: D

Question 3

Clinicians must consider Vancomycin as a last resort antimicrobial agent to treat infections because of the emergence of vancomycin resistant Enterococcus.

True or False?

Answer 3

Answer: True

Question 4

Which of the following is a Streptococcus species belonging to the Lancefield group G can cause 
     fatal illness in cats?
A. S. Equi subspecies zooepidemicus
B. S. Felis
C. S. Canis
D. S. Suis

Answer 4

Streptococcus canis (S.canis)

Question 5

The bacteria in this image is most likely;

A. Streptococcus
B. Staphylococcus
C. Rhodococcus
D. Micrococcus

Answer 5

Streptococcus

Note: Cocci are in chains

Question 6

What disease will be in the top of your differential diagnosis list when a horse is presented to you with this lesion?

A. Pyoderma
B. Strangles
C. Scarlet fever
D. Lymphadenitis

Answer 6

B. Strangles

Note: Strangles = disease name. Pyoderma = a skin infection.
Infection of guttural pouches symptoms would be bleeding from the nose

Question 7

Which of the following is a Streptococcus species belonging to the Lancefield group G can cause fatal illness in cats?

A. S. equi subsp. zooepidemicus
B. S. felis
C. S. canis
D. S. suis

Answer 7

S. canis

Note: Can cause serious problems in cats and dogs

Question 8

Which of the following Streptococcus sp. is an important pathogen in fish

A. S. pneumonia
B. S. suis
C. S. iniae
D. S. pyogenes

Answer 8

S. iniae

Note: Causes septicemia in fish and it can be a zoonotic pathogen