350x350px<unk>  is extremely contagious, but surviving the infection results in lifelong immunity, so its continued circulation in a community depends on the generation of susceptible hosts by birth of children. In communities which generate insufficient new hosts the disease will die out. This concept was first recognized by Bartlett in 1957, who referred to the minimum number supporting<unk>  as the critical community size (CCS). Analysis of outbreaks in island communities suggested that the CCS for<unk>  is c. 250,000.
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