title: Etiology of meningitis in Portugal.
mesh_terms: D000367:Age Factors; D006090:Gram-Negative Bacteria / Q000302:isolation & purification; D006801:Humans; D008581:Meningitis / Q000453:epidemiology / Q000382:microbiology* / Q000401:mortality; D008584:Meningitis, Listeria / Q000453:epidemiology / Q000401:mortality; D008585:Meningitis, Meningococcal / Q000453:epidemiology / Q000401:mortality; D008586:Meningitis, Pneumococcal / Q000453:epidemiology / Q000401:mortality; D011174:Portugal