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*highest < 2 y/o and adolescent
*annual outbreak during dry season in meningitis belt
**dry winds make people's nose drier resulting in easyeasier capture and membrane breakthrough
*wide range difference of nasopharynx carriage between countries
**reason totally unknown
**NZ & 3%
**Nigeria muslim boarding house school 30-40%*日本で戦後急速に発生が減ったのは，抗菌薬の導入普及と発熱早期での過剰投与，および住宅環境の改善による小児の集蔟が減少したためかもしれない
==transmission==
