Neisseria meningitidis is widely considered to be the most common cause of bacterial meningitis in this age group, although some references state that Streptococcus pneumoniae has equal prevalence. Haemophilus influenzae type b was the most common organism prior to widespread vaccination. The most common pathogens in neonatal meningitis are Escherichia coli, Listeria monocytogenes, and group B streptococci.
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