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Control and elimination in an SEIR model for the disease dynamics of COVID-19 with vaccination

Witbooi Peter Joseph Vyambwera Sibaliwe Maku Nsuami Mozart Umba

Witbooi Peter Joseph, Vyambwera Sibaliwe Maku, Nsuami Mozart Umba. Control and elimination in an SEIR model for the disease dynamics of COVID-19 with vaccination[J]. JOURNAL OF MECHANICAL ENGINEERING. doi: 10.3934/math.2023411
Citation: Witbooi Peter Joseph, Vyambwera Sibaliwe Maku, Nsuami Mozart Umba. Control and elimination in an SEIR model for the disease dynamics of COVID-19 with vaccination[J]. JOURNAL OF MECHANICAL ENGINEERING. doi: 10.3934/math.2023411

Control and elimination in an SEIR model for the disease dynamics of COVID-19 with vaccination

doi: 10.3934/math.2023411
More Information
    Corresponding author: Witbooi Peter Joseph, Email: pwitbooi@uwc.ac.za; Tel: +27(0)219593027; Fax: +27(0)219591241
  • Figure  1.  Structure of COVID-19 model

    Figure  2.  New cases in South Africa over the period 24 July 2020 – 05 November 2020

    Figure  3.  New cases in South Africa over the period 08 January 2021 – 29 April 2021

    Figure  4.  Stabilization of the model subsequent to April 2021

    Figure  5.  $ u_1 $: vaccination component of the optimal control

    Figure  6.  $ u_2 $: reduction of the contact rate during optimal control

    Figure  7.  Comparison of the E-classes under optimal control

    Figure  8.  E-classes under optimal control (with adjusted initial values)

    Figure  9.  I-classes under optimal control (with adjusted initial values)

    $ P_0 $ The size of the population at the disease-free state
    $ A_0 $ Rate of birth of newborns, assumed to be susceptibles; Note that $ A_0 > 0 $
    $ A_1 $ Rate of inflow into the $ E $-class; $ A_1\geq 0 $
    $ \theta(I) $ Contact rate, a function of $ I $
    $ \delta_1 $ and $ \delta_2 $ Disease-induced mortality rate, for $ E $ and $ I $ classes, respectively
    $ z $ Vaccination rate
    $ \alpha $ Transfer rate of from $ E $-class to $ I $-class
    $ \omega_1 $ Transfer rate of from $ E $-class to $ R $-class
    $ \omega_2 $ Transfer rate of from $ I $-class to $ R $-class
    $ \mu $ The average mortality rate by natural causes.
    下载: 导出CSV

    Table  1.   Parameter values

    Parameters Numerical values Source
    $ P_0 $ 69281690 cf. [33]
    $ \mu $ $ 8.43\times 10^{-5} $ [33]
    $ A_0 $ $ \mu P_0 $ (standard)
    $ A_1 $ 0 nominal
    $ \beta $ $ 0.39/P_0 $ fitted
    $ b $ $ 7\times 10^{-5} $ fitted
    $ \alpha $ 1/9 [32]
    $ z $ 0 see Remark 6.2.1
    $ \delta_1 $ $ 0.05\delta_2 $ estimate
    $ \delta_2 $ $ 0.0015 $ [12]
    $ \omega_1 $ $ 0.05\omega_2 $ estimate
    $ \omega_2 $ 0.006 [28]
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-09-04
  • 修回日期:  2022-11-16
  • 录用日期:  2022-11-22
  • 网络出版日期:  2023-02-02

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