Modeling and analysis of the effect of optimal virus control on the spread of HFMD.

Figure 8 shows that the optimal u 1 ∗ ( t ) , u 2 ∗ ( t ) are a decreasing trend, meanwhile u 1 ∗ ( 3 ) = 0.0149 , u 2 ∗ ( t ) = 0.5518 , which means the effects of optimal controls with respect to virus load per capita are first strong and then weak (seeing Fig. 9 ).

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