In their article, N A Kudryashov, M A Chmykhov, M Vigdorowitsch, “Analytical features of the SIR model and their applications to COVID-19”, Applied Mathematical Modelling 90 (2021) 466–473, aimed to establish the relationships among S, I and R populations, as well as to suggest a form for the exact solution of the SIR model One of the equations given there is wrong, which leads to an error in the solution The objective of the present letter is to present the correct parametric solution and to discuss its numerical approximation by direct quadrature
Comments on some analytical and numerical aspects of the SIR model