We have further extended our compartmental model describing the spread of the infection in
Italy. As in our previous work, the model assumes that the time evolution of the observable …

In this paper a delayed stochastic SLVIQR epidemic model, which can be applied for
modeling the new coronavirus COVID-19 after a calibration, is derived. Model is constructed …

In this work we use simple mathematical models to study the impact of vaccination against
COVID-19 in Portugal. First, we fit a SEIR type model without vaccination to the Portuguese …

In this note, we consider a compartmental epidemic mathematical model given by a system
of differential equations. We provide a complete toolkit for performing both a symbolic and …

The recent trends of the COVID-19 research are being devoted to disease transmission
modeling in presence of vaccinated individuals, while the emerging needs are being …

We analyze mathematical models for COVID-19 with discrete time delays and vaccination.
Sufficient conditions for the local stability of the endemic and disease-free equilibrium points …

Recently, a continuous-time compartmental mathematical model for the spread of the
Coronavirus disease 2019 (COVID-19) was presented with Portugal as case study, from 2 …

The emergence of the COVID-19 pandemic has been a major social and economic
challenge globally. Infections from infected surfaces have been identified as drivers of Covid …

The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pandemic hit almost all
cities in Brazil in early 2020 and lasted for several months. Despite the effort of local state …

The recent trends of the COVID-19 research have been devoted to disease transmission
modeling, with the aim of investigating the effects of different mitigation strategies mainly …