ABSTRACT
In this paper, we have extended SEIR model of COVID-19 with the inclusion of single and double dose of vaccination compartments. The model is governed by seven dimensional system of ordinary differential equation. The seven compartmental model is analysed and based on the real cumulative numbers of COVID-19 reported cases in India, data has been fitted successfully. The three years time span of the data is taken from 1 January, 2021 to 31 December, 2023. We have investigated disease free equilibrium (DFE) points, basic reproduction number, stability analysis, parameter estimation, model fitting with real data, residual, effect of vaccination drive, sensitivity analysis and contour plots on and . It has been observed that the basic reproduction number is less than one which shows that the disease will be over in near future. Particularly, the study shows that, an increase in the vaccination rates (both first and second dose), reduces the number of infected individuals and increase the recovered individuals. Thus, it is evident that vaccination drive have ample power to reduce the disease burden in the population.
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