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SIQRS Epidemic Modelling and Stability Analysis of COVID-19

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Predictive and Preventive Measures for Covid-19 Pandemic

Abstract

In this research article, the spread of COVID-19 due to infectious immigrants with effect of quarantine is investigated using SIQRS epidemic model. The rate of natural death in COVID-19 is embedded in this model. The mathematical equations are solved using Range–Kutta fourth-order method carried by the numerical simulation and graphical interpretation using MATLAB software. We have discussed the stability analysis of infection-free and endemic equilibrium with the help of basic reproduction number. According to the mathematical analysis of Routh–Hurwitz criteria, the system is local asymptotic stable at the equilibrium points when R0 < 1 and unstable when R0 > 1. Moreover, Dulac function and Poincare–Bendixson theorem are applied for the analysis of global stability when R0 > 1. It is also observed from different figures that in a short-term period, the rate of transmission of COVID-19 patients increases. However, in the long run approximately in 120 to 180 days, it becomes stable due to the powerful controlling technique called ‘quarantine or isolation’. The endemic infective class size decreases in Quarantine class, which also leads to disease extinction.

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Abbreviations

S :

Susceptible class

I :

Infected class

Q :

Quarantine class

R :

Removed class

R o :

Basic reproduction number

α :

Transmission rate per day from S to I

β :

Transmission rate per day from I to Q

γ :

Transmission rate per day from Q to R

σ :

Recovered rate per day from R to S

μ :

Rate of infected immigrant to infected class

θ :

Natural death rate

η :

COVID-19 death rate

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Correspondence to Yerra Shankar Rao .

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Rauta, A.K., Rao, Y.S., Behera, J., Dihudi, B., Panda, T.C. (2021). SIQRS Epidemic Modelling and Stability Analysis of COVID-19. In: Khosla, P.K., Mittal, M., Sharma, D., Goyal, L.M. (eds) Predictive and Preventive Measures for Covid-19 Pandemic. Algorithms for Intelligent Systems. Springer, Singapore. https://doi.org/10.1007/978-981-33-4236-1_3

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