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. 2011 Feb 10;240(11):943–948. doi: 10.1016/j.physd.2011.02.001

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Copyright © 2011 Elsevier B.V. All rights reserved.

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Fig. 1 — The effect of $δ$ on the number of infections $n_{I} (t)$ for the preferential case with $β = 0.04, μ = 0.1, c = 1.0$ , and $f_{v}^{P} = 0.15$ . We also take other values for these parameters and make simulations for the uniform case, and the results are similar. Furthermore, in the following figures, $n_{I} (t)$ and $n_{V} (t)$ denote the number of infections and vaccinations at time $t$ , respectively.