Optimal impulse control of West Nile virus

Folashade Agusto; Daniel Bond; Adira Cohen; Wandi Ding; Rachel Leander; Allis Royer; Folashade Agusto; Daniel Bond; Adira Cohen; Wandi Ding; Rachel Leander; Allis Royer

doi:10.3934/math.20221075

AIMS Mathematics

2022, Volume 7, Issue 10: 19597-19628. doi: 10.3934/math.20221075

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Optimal impulse control of West Nile virus

1.
Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, KS
2.
Department of Mathematics and Statistics, Mississippi State University, Mississippi State, MS
3.
Department of Mathematics and Statistics, University of Massachusetts Amherst, Amherst, MA
4.
Department of Mathematical Sciences, Computational and Data Sciences Program, Middle Tennessee State University, Murfreesboro, TN
5.
Department of Mathematics & Statistical Sciences, Jackson State University, Jackson, MS

Received: 30 June 2022 Revised: 21 August 2022 Accepted: 31 August 2022 Published: 05 September 2022
MSC : 49N25, 49K15, 92D30, 92B05

We construct a West Nile virus epidemic model that includes the interaction between the bird hosts and mosquito vectors, mosquito life stages (eggs, larvae, adults), and the dynamics of both larvicide and adulticide. We derive the basic reproduction number for the epidemic as the spectral radius of the next generation matrix. We formulate two impulsive optimal control problems which seek to balance the cost of insecticide applications (both the timing and application level) with the benefit of (1) vector control: reducing the number of mosquitoes or (2) disease control: reducing the disease burden. We reformulate these impulsive optimal control problems as nonlinear optimization problems and derive associated necessary conditions for the optimal controls. Numerical simulations are used to address three questions: How does the control and its impact on the system vary with the objective type? Is it beneficial to optimize the treatment timing? How does the control and its impact on the population vary with the type of pesticide used?
- impulsive optimal control,
- West Nile virus
Citation: Folashade Agusto, Daniel Bond, Adira Cohen, Wandi Ding, Rachel Leander, Allis Royer. Optimal impulse control of West Nile virus[J]. AIMS Mathematics, 2022, 7(10): 19597-19628. doi: 10.3934/math.20221075

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Abstract

We construct a West Nile virus epidemic model that includes the interaction between the bird hosts and mosquito vectors, mosquito life stages (eggs, larvae, adults), and the dynamics of both larvicide and adulticide. We derive the basic reproduction number for the epidemic as the spectral radius of the next generation matrix. We formulate two impulsive optimal control problems which seek to balance the cost of insecticide applications (both the timing and application level) with the benefit of (1) vector control: reducing the number of mosquitoes or (2) disease control: reducing the disease burden. We reformulate these impulsive optimal control problems as nonlinear optimization problems and derive associated necessary conditions for the optimal controls. Numerical simulations are used to address three questions: How does the control and its impact on the system vary with the objective type? Is it beneficial to optimize the treatment timing? How does the control and its impact on the population vary with the type of pesticide used?

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