The outbreak of COVID-19 led the world to an extreme health and economic cataclysm. As
the epidemic stays the course, the researchers worldwide attempt to study its features and to …

COVID-19 takes a gigantic form worldwide in a short time from December, 2019. For this
reason, World Health Organization (WHO) declared COVID-19 as a pandemic outbreak. In …

This work deals with the inverse problem in epidemiology based on a SIR model with time-
dependent infectivity and recovery rates, allowing for a better prediction of the long term …

Data from the World Health Organization indicate that Bulgaria has the second-highest
COVID-19 mortality rate in the world and the lowest vaccination rate in the European Union …

Since the end of 2019, with the outbreak of the new virus COVID-19, the world changed
entirely in many aspects, with the pandemia affecting the economies, healthcare systems …

In this paper we introduce a time-dependent SEIR-based model with vaccination. In the
suggested model the host population is divided into seven compartments: susceptible …

Several research papers have attempted to describe the dynamics of COVID-19 based on
systems of differential equations. These systems have taken into account quarantined or …

In the context of the COVID–19, a great deal of attention is attracted in studying the infectious
disease from both academics and practitioners. One of the most powerful tools for …

In this article, we have considered nine countries where the epidemic shows steady state or
has a rising trend and used the traditional SEIR model to estimate the parameter for COVID …

We present a modelling and analysis of the COVID-19 outbreak in India with an emphasis
on the socio-economic composition, based on the progress of the pandemic (during its first …