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8480 Microbiology

A 2 month old infant develops fever, lethargy, and seizures. The infant had been born at term with no obstetric or early postnatal complications. Physical examination after the seizure demonstrates nuchal rigidity and bulging fontanelles. Lumbar puncture reveals a high CSF neutrophil count and gram-positive cocci in chains. Which of the following is the most likely pathogen?

ACoagulase-negative staphylococci
BEscherichia coli
CGroup B streptococcus
DNeisseria meningitidis
Microbiology
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