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Critical community size (CCS) is the minimum size of a closed population within which a human-to-human, non-zoonotic pathogen can persist indefinitely.〔Bartlett MS The critical community size for measles in the United States. J R Stat Soc (A ). 1960;123:37–44.〕 When the size of the closed population falls below the CCS level, the low density of infected hosts causes extinction of the pathogen.〔Daniel T. Haydon. Identifying Reservoirs of Infection: A Conceptual and Practical Challenge. Emerg Infect Dis. 2002 December; 8(12): 1468–1473.〕 This epidemiologic phenomenon was first identified during measles outbreaks in the 1950s.〔 ==See also== * Compartmental models in epidemiology * Epidemic model * Epidemiology * Force of infection * Mathematical modelling of infectious disease * Transmission risks and rates 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「critical community size」の詳細全文を読む スポンサード リンク
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