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Critical community size

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The critical community size (CCS) is the minimum size of a closed population within which a human-to-human, non-zoonotic pathogen can persist indefinitely.

When the size of the closed population falls below the critical community size level, the low density of infected hosts causes extinction of the pathogen. This epidemiologic phenomenon was first identified during measles outbreaks in the 1950s.

References

Critical community size Wikipedia


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