Meningococcal meningitis occurs in small clusters throughout the world with seasonal variation and accounts for a variable proportion of epidemic bacterial meningitis.

脑膜炎球菌性脑膜炎在全世界以小型聚集方式出现，存在季节性变化，占流行性细菌性脑膜炎的比例并不固定。

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Meningococcal meningitis occurs in small clusters throughout the world with seasonal variation and accounts for a variable proportion of epidemic bacterial meningitis.

脑膜炎球菌性脑膜炎在全世界以小型聚集方式出现，存在季节性变化，占流行性细菌性脑膜炎的比例并不固定。

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