Abstract
The purpose of this paper is to determine the precise asymptotic spreading speed of the virus for a West Nile virus model with free boundary, introduced recently in Lin and Zhu (J Math Biol 75:1381–1409, 2017), based on a model of Lewis et al. (Bull Math Biol 68:3–23, 2006). We show that this speed is uniquely defined by a semiwave solution associated with the West Nile virus model. To find such a semiwave solution, we firstly consider a general cooperative system over the half-line \([0,\infty )\), and prove the existence of a monotone solution by an upper and lower solution approach; we then establish the existence and uniqueness of the desired semiwave solution by applying this method together with some other techniques including the sliding method. Our result indicates that the asymptotic spreading speed of the West Nile virus model with free boundary is strictly less than that of the corresponding model in Lewis et al. (2006).
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Acknowledgements
This work is supported by the Natural Science Foundation of China (11671243, 11771262, 61672021), the Natural Science Foundation of Shaanxi Province (2018JM1020), and the Fundamental Research Funds for the Central Universities (GK201701001). Y. Du was supported by the Australian Research Council.
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Wang, Z., Nie, H. & Du, Y. Spreading speed for a West Nile virus model with free boundary. J. Math. Biol. 79, 433–466 (2019). https://doi.org/10.1007/s00285-019-01363-2
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DOI: https://doi.org/10.1007/s00285-019-01363-2