📈 Beyond Bilinear Incidence: Nonlinear Transmission in Epidemic Models
Introduction Classical compartmental epidemic models such as the SIR model assume a bilinear incidence term of the form β S I, meaning new infections occur in direct proportion to the product of susceptible (S) and infectious (I) individuals. This simple incidence function assumes homogeneous mixing and unlimited contacts. Real disease transmission often deviates from this … Read more