Fig. 6. Outbreak dynamics. Sensitivity with respect to the basic reproduction number R₀.

Decreasing the basic reproduction number decreases the exposed and infectious populations. The susceptible and recovered populations converge to larger and smaller endemic equilibrium values, and converges is slower. The steepest susceptible, exposed, infectious, and recovery curves correspond to the largest basic reproduction number of R₀ = 10.0 with the maximum infectious population of I_max = 0.488 after 35 days and converge to an endemic equilibrium at S_∞ = 0.0001 and R_∞ = 0.9999. Latent period A = 5 days, infectious period C = 20 days, basic reproduction number R₀ = C/B = 1.5, 1.7, 2.0, 2.4, 3.0, 5.0, 10.0, and initial exposed fraction E₀ = 0.010.