Test 26  (microbiology)
1. Staphylococcus aureus:
a. is sensitive to fusidic acid

b. is resistant to phagocytosis by neutrophils

c. produces exotoxins

d. is the most common cause of carbuncle

e. phage type I and II are the commonest cause of boils

2. The following can be used to identify Staphylococcus aureus:

a. identification of Lancefield groups through serology

b. phosphatase positivity

c. coagulase positivity

d. fermentation of mannitol

e. golden appearance of colonies

3. The effect of endotoxins include:

a. inhibition of platelet aggregation

b. inhibition of Hageman factor

c. release of interleukin 1

d. initial leucopenia

e. activation of the alternative complement pathway.


4. True statements about Actinomyces israeli include:
a. it is a strict anaerobe

b. it is a bacteria

c. it causes chronic canaliculitis

d. it is usually sensitive to penicillin

e. infection is associated with discharges containing yellow sulphur granules.


5. With regard to antibiotics:
a. vancomycin and penicillin inhibit bacterial cell wall synthesis through 
    the same mechanisms.

b. vancomycin is poorly absorbed from the gut

c. metronidazole crosses the blood-brain barrier readily

d. sulphonamides crosses the blood-brain barrier readily

e. chloramphenicol is active against Pseudomonas bacteria


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