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Pathogens in Bacterial Meningitis

Topic: Adult

Created on Thursday, March 20 2008 by jdmiles

Last modified on Thursday, March 20 2008.

A 30 year-old immunocompetent male presents with bacterial meningitis. Of the following options, which is the most likely pathogen?

 
        A) H. influenzae
 
        B) N. meningitidis
 
        C) E. coli
 
        D) S. agalactiae
 
        E) L. monocytogenes
 

 


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This question was created on March 20, 2008 by jdmiles.
This question was last modified on March 20, 2008.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ANSWERS AND EXPLANATIONS




A) H. influenzae

This answer is incorrect.


S. pneumoniae and N. meningitidis are the most common pathogens isolated from CSF in immunocompetent patients aged 18 to 50 years who have bacterial meningitis. H. influenzae is more commonly seen in patients 4 months to 17 years of age.  (See References)

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B) N. meningitidis

This answer is correct.


S. pneumoniae and N. meningitidis are the most common pathogens isolated from CSF in immunocompetent patients aged 18 to 50 years who have bacterial meningitis.  (See References)

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C) E. coli

This answer is incorrect.


S. pneumoniae and N. meningitidis are the most common pathogens isolated from CSF in immunocompetent patients aged 18 to 50 years who have bacterial meningitis. S. agalactiae, E. coli, and L. monocytogenes are the most common pathogens in infants less than 2 months of age.  (See References)

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D) S. agalactiae

This answer is incorrect.


S. pneumoniae and N. meningitidis are the most common pathogens isolated from CSF in immunocompetent patients aged 18 to 50 years who have bacterial meningitis. S. agalactiae, E. coli, and L. monocytogenes are the most common pathogens in infants less than 2 months of age.  (See References)

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E) L. monocytogenes

This answer is incorrect.


S. pneumoniae and N. meningitidis are the most common pathogens isolated from CSF in immunocompetent patients aged 18 to 50 years who have bacterial meningitis. S. agalactiae, E. coli, and L. monocytogenes are the most common pathogens in infants less than 2 months of age. L. monocytogenes is also commonly seen in patients more than 50 years old, or patients with impaired cellular immunity.  (See References)

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References:

1. Quagliarello, V.J., and Scheld, W.M. (1997). "Treatment of bacterial meningitis." N Engl J Med, 336(10) 708-16. (PMID:9041103)
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adult
Pathogens in Bacterial Meningitis
Question ID: 032008014
Question written by J. Douglas Miles, (C) 2006-2009, all rights reserved.
Created: 03/20/2008
Modified: 03/20/2008
Estimated Permutations: 240

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