Abstract The phenomenon of bifurcation in disease transmission models has been observed in a number of epidemiological models. The consequence of bifurcation is that the classical requirement of the reproduction number being less than unity becomes only a necessary. but not sufficient. for disease elimination. https://www.ealisboa.com/top-sale-AR-10-Vert-Monoband-Indep-10m-2-Ringo-quick-deal/