Khan, HasibAlzabut, JehadTunc, OsmanKaabar, Mohammed K. A.2025-05-102025-05-1020232666-720710.1016/j.rico.2023.1001992-s2.0-85147104523https://doi.org/10.1016/j.rico.2023.100199https://hdl.handle.net/20.500.14720/1046Kaabar, Mohammed/0000-0003-2260-0341In this article, we consider a Covid-19 model for a population involving diabetics as a subclass in the fractal-fractional (FF) sense of derivative. The study includes: existence results, uniqueness, stability and numerical simulations. Existence results are studied with the help of fixed-point theory and applications. The numerical scheme of this paper is based upon the Lagrange's interpolation polynomial and is tested for a particular case with numerical values from available open sources. The results are getting closer to the classical case for the orders reaching to 1 while all other solutions are different with the same behavior. As a result, the fractional order model gives more significant information about the case study.eninfo:eu-repo/semantics/openAccessFractal-Fractional DerivativeCovid-19 Mathematical ModelExistence ResultsStability Of SolutionNumerical SimulationsArticle10N/AQ3WOS:001208974200017