  A model of an Ebola epidemic is developed with infected individuals
structured according to disease age. The transmission of the infection is
tracked by disease age through an initial incubation (exposed) phase, followed
by an infectious phase with variable transmission infectiousness. The removal
of infected individuals is dependent on disease age, with three types of
removal rates: (1) removal due to hospitalization (isolation), (2) removal due
to mortality separate from hospitalization, and (3) removal due to recovery
separate from hospitalization. The model is applied to the Ebola epidemics in
Sierra Leone and Guinea. Model simulations indicate that successive stages of
increased and earlier hospitalization of cases have resulted in mitigation of
the epidemics.
