new_n_lost
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A patient is referred to a neurologist because of ataxia. Neurological examination reveals a loss of proprioception and a wide-based, slapping gate Magnetic resonance imaging reveals degeneration of the dorsal columns and dorsal roots of the spinal cord.
Which of the following organisms is most likely to have caused this pattern of damage?
A. Haemophilus influenzae
B. Herpes simplex I
C. Neisseria gonorrhoeae
D. Neisseria meningitidis
E. Treponema pallidum
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| unique1
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E
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| po
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tabes dorsalis
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| silver
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E. Treponema pallidum
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| new_n_lost
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FORUM RULES-- Those who believe in telekinesis, raise my hand. I get enough exercise just by pushing my luck --P4U World.." The pure and simple truth is rarely pure and never simple."
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| new_n_lost
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The correct answer is E.
The findings described are those of tabes dorsalis, a form of tertiary syphilis caused by Treponema pallidum. Tabes dorsalis, and other forms of tertiary syphilis, are now uncommon in this country, possibly because the common use of antibiotics may "treat" many unsuspected cases of syphilis.
Haemophilus influenzae (choice A) and Neisseria meningitidis (choice D) can cause meningitis.
Neisseria gonorrhoeae (choice C) causes gonorrhea, which usually does not involve the CNS.
Herpes simplex I (choice B) can cause an encephalitis that typically involves the frontal and temporal lobes.
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FORUM RULES-- Those who believe in telekinesis, raise my hand. I get enough exercise just by pushing my luck --P4U World.." The pure and simple truth is rarely pure and never simple."
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| lq2006
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Treponema pallidum
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