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The state of
equilibrium (where R=1) can help us explore the immunisation level required for the
eradication of an infectious agent.From the definition of R (see previous slide),
it is: In the state of equilibrium, it is: If we solve for (I/N)eq, we get: On reflection, we realise that (I/N)eq is the necessary
proportion of immunes in the population in order to have equilibrium (R=1). In other
words, if the proportion of immunes were If this level of population immunity is achieved by mass vaccination, we can consider
(I/N)eq as |