We use Lie point symmetries to obtain reductions and closed-form solutions for the
diffusive SIR epidemic model with diffusion and nonlinear incidence. We determine
that the Lie algebra for this model is three-dimensional. We invoke these to establish
closed-form solutions of the diffusive SIR model. Furthermore, we utilized the closedform
solutions to generate a graphical representation of the infected curve, and
carried out a sensitivity analysis to gain valuable insights into the transmission
dynamics of the epidemic. Additionally, the most general Lie symmetry generator
is used to find the reductions and numerical solutions.