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Eyes are relatively vulnerable to infection because


A) they are not covered by keratinized epithelium.
B) immune privilege restricts access to the cells conferring innate immunity.
C) there is scant normal microbiota to serve a protective role.
D) All of these answers are correct.

E) All of the above
F) B) and D)

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The most serious teratogenic effects of intrauterine rubella infection occur if it is acquired during the third trimester.

A) True
B) False

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The eye generally has a large percentage of normal biota present.

A) True
B) False

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To perform the coagulase test on a strain of bacteria that is believed to be S.aureus, the first step is to inoculate a tube of ______ with the strain of interest.


A) blood plasma
B) nutrient broth
C) mannitol salt medium
D) blood

E) C) and D)
F) A) and D)

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Which of the following provides the eye with its best defense against microorganisms?


A) Tears
B) Conjunctiva
C) Eyelashes
D) Eyelids
E) Lymphocytes

F) A) and B)
G) A) and C)

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Which of the following statements does not pertain to Streptococcus pyogenes?


A) It causes gas gangrene.
B) It secretes streptokinase.
C) It is often spread from an endogenous source.
D) It coats itself with host proteins.
E) It causes impetigo.

F) A) and E)
G) B) and D)

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