Stochastic Periodic Solution of a Susceptible-Infective Epidemic Model in a Polluted Environment under Environmental Fluctuation.

Moreover, one interesting finding is that the decrease of susceptible S ( t ) is beneficial to the decreasing trend of infected cases I ( t ); that is, if we can reduce the number of the susceptible subpopulation, the cases of measles will show a decreasing trend in the future (see Figure 5 , blue lines).

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