A 5-Week-Old Girl Is Brought to the Emergency Department Due

A 5-week-old girl is brought to the emergency department due to several hours of fever, irritability, and vomiting.  This morning she was warm to the touch and refused to drink.  Her temperature is 40.1 C (104.2 F) .  Lumbar puncture reveals cerebrospinal fluid pleocytosis; additional fluid is sent for Gram stain and culture.  Empiric cefotaxime and vancomycin therapy is initiated.  However, no clinical improvement is seen.  Cerebrospinal fluid culture yields an organism that is resistant to cefotaxime.  Which of the following organisms is most likely causing this patient's infection?

A) Haemophilus influenzae
B) Listeria monocytogenes
C) Neisseria meningitidis
D) Streptococcus agalactiae
E) Streptococcus pneumoniae

Correct Answer:

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