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.
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.
Source: Wikipedia "Critical community size" · CC BY-SA 4.0
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