Abstract The aim of this article is to study the known susceptible-infectious (SI) epidemic model using fractional order reaction-diffusion partial differential equations [FPDEs] in better describe dynamics a SI with nonlinear incidence rate describing infection HIV/AIDS virus. We initially examined nonnegativity, global existence, and boundedness for solutions proposed system. After determinin...

Coronavirus disease 2019 (COVID-19) is an infection that can result in lung issues such as pneumonia and, extreme situations, the most severe acute respiratory syndrome. COVID-19 widely investigated by researchers through mathematical models from different aspects. Inspired literature, present paper, generalized deterministic model considered and examined. The basic reproduction number obtained...