A 16-day-old infant presents with fever, irritability, poor feeding, and a bulging fontanelle. Spinal fluid demonstrates gram-positive cocci. Which of the following is the most likely diagnosis?

a. Listeria monocytogenes

b. Group A streptococcus

c. Group B streptococcus

d. Streptococcus pneumoniae

e. Staphylococcus aureus

the answer is below…

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