As people around the world work to stop the COVID-19 pandemic, mutated COVID-19 (Delta
strain) that are more contagious are emerging in many places. How to develop effective and …

As there is no vaccination and proper medicine for treatment, the recent pandemic caused
by COVID-19 has drawn attention to the strategies of quarantine and other governmental …

In this article, a mathematical model for the transmission of COVID-19 disease is formulated
and analysed. It is shown that the model exhibits a backward bifurcation at R 0= 1 when …

Optimal economic evaluation is pivotal in prioritising the implementation of non-
pharmaceutical and pharmaceutical interventions in the control of diseases. Governments …

The world experienced the life-threatening COVID-19 disease worldwide since its inversion.
The whole world experienced difficult moments during the COVID-19 period, whereby most …

Our research focuses on studying a COVID-19 SIR model for discrete cases, incorporating bi-
linear phenomena and a constant rate of recovery. We have interested in analyzing the …

Understanding the early transmission dynamics of diseases and estimating the effectiveness
of control policies play inevitable roles in the prevention of epidemic diseases. To this end …

Abstract Coronavirus disease (COVID-19) is the biggest public health challenge the world is
facing in recent days. Since there is no effective vaccine and treatment for this virus …

Multiple strains of the SARS-CoV-2 have arisen and jointly influence the trajectory of the
coronavirus disease (COVID-19) pandemic. However, current models rarely account for this …

In this paper, we formulated a general model of COVID-19model transmission using
biological features of the disease and control strategies based on the isolation of exposed …