<prompt> Most common organism causing neonatal meningitis isE. coliListeriaPseudomonasStaph aureus  <response>: The most common causes of neonatal meningitis is bacterial infection of the blood, known as bacteremia specifically group B streptococci Streptococcus agalactiae, Escherichia coli, and Listeria monocytogenes . Reference: GHAI Essential pediatrics, 8th edition 