The global COVID-19 pandemic began in December 2019 and spread rapidly around the
world. Worldwide, more than 230 million people fell ill, 4.75 million cases were fatal. In …

The paper presents a compartment model of the dynamics of the incidence of the new
coronavirus (COVID-19). An approach to the construction of SIR models is shown. The SIRF …

The COVID-19 pandemic, which has been going on for almost three years, has shown that
public health systems are not ready for such a challenge. Measures taken by governments …

The COVID-19 pandemic has posed a challenge to public health systems worldwide. As of
March 2022, almost 500 million cases have been reported worldwide. More than 6.2 million …

In this work, mathematical modelling of the dynamics of coronavirus COVID-19 is performed
for the following countries: the USA, Germany, the UK and the Russian Federation. Cases of …

Coronavirus or COVID-19 is a widespread pandemic that has affected almost all countries
around the globe. The quantity of infected cases and deceased patients has been …

On 30 July 2020, a total number of 301,530 diagnosed COVID-19 cases were reported in
Iran, with 261,200 recovered and 16,569 dead. The COVID-19 pandemic started with 2 …

The development of the situation around Covid-19 is an urgent problem for the whole world,
and it is still not known exactly how the pandemic will develop. However, based on the data …

Background The rapid spread of COVID-19 virus from China to other countries and
outbreaks of disease require an epidemiological analysis of the disease in the shortest time …

COVID-19 has become the largest pandemic in recent history to sweep the world. This study
is devoted to developing and investigating three models of the COVID-19 epidemic process …