Critical community size

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.^[1]

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.^[2] This epidemiologic phenomenon was first identified during measles outbreaks in the 1950s.^[1]

The critical community size depends on:^{[citation needed]}

• Speed of transmission
• How long until a person who has recovered remains immune
• Fatality rate
• Birth and death rate in the general population

See also

• Compartmental models in epidemiology – Type of mathematical model used for infectious diseases
• Social:Epidemiology – Study of health and disease within a population
• Medicine:Force of infection – Rate at which susceptible individuals acquire an infectious disease
• Biology:Mathematical modelling of infectious disease – Using mathematical models to understand infectious disease transmission
• Medicine:Transmission risks and rates

References

External links

• The Collection of Biostatistics Research Archive
• 'Epidemiology' – In: Philip S. Brachman, Medical Microbiology (fourth edition), US National Center for Biotechnology Information
• Monash Virtual Laboratory - Simulations of epidemic spread across a landscape
• People's Epidemiology Library

0.00 (0 votes) Original source: https://en.wikipedia.org/wiki/Critical community size. Read more