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Meningitis pathogens by age group

Microbiology/Nervous
3 agents < 3 years old: LEGacy of the mother (often acquired through birth canal in vaginal deliveries): Listeria monocytogenes
E. Coli K1
Group B Strep (Streptococcus agalactiae)
After 6 months, with loss of maternal antibodies but before humoral immunity develops: "No Himmunity" Neisseria meningitides
Hib (Hemophilus influenzae type b)
Adults and the elderly: Strep pneumoniae
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