I'm a little confused about the causes of bacterial meningitis in adults. For the most part, different books seem to agree on newborns, children and the elderly. But here is what different sources say on adults.: First Aid (6-60 yrs): 1. N. meningitidis 2. S. pneumonia MedEssentials (adolescence / young adults): N. meningitidis UWorld (adults): 1. S. pneumonia 2. N. meningitidis I'm not including CMMRS because they do not differentiate between children and adults. But it doesn't even mentioned S. pneumonia as a major cause of bacterial meningitis. What's the correct answer?