Simulation of infectious disease by Reed-Frost model with proportion of immune and inapparent infection.

A modified Reed-Frost model into which the proportions of immune, and of inapparent infections were introduced, has been examined in order to find how it might affect the predicted epidemic curve. Under the conditions of a constant community size and a constant epidemic size, the modified Reed-Frost model yielded a predicted epidemic curve which was distributed in a relatively narrower range, possessed a higher peak, and which came much earlier than that produced by the Reed-Frost model without the above modifications.