Between 1997 and 2010, the number of cases of Americans with bacterial meningitis, mostly caused by Streptococcus pneumoniae, fell by 63%, according to a study in The Lancet Infectious Diseases. Neisseria meningitidis-related meningitis cases dropped 86% during the study period. The declines were attributed to the introduction of two meningococcal vaccines and dexamethasone treatment.

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