Evolution of model (2) showing the state trajectories for the relative amounts of susceptible population (<i>S</i>/<i>N</i>), latently infected population (<i>E</i>/<i>N</i>), infectious population ((<i>I</i>+<i>L</i>+<i>J</i>)/<i>N</i>), and recovered population (<i>R</i>/<i>N</i>).

<p>Parameter values are defined in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0120607#pone.0120607.t002" target="_blank">Table 2</a> and initial values are presented in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0120607#pone.0120607.t003" target="_blank">Table 3</a>.</p>