Conceptual model of Rift Valley fever (RVF) transmission.

<p>Flow diagram describing the model used for RVF spread in populations of adult mosquitoes (<i>V</i>), aquatic stage of mosquitoes (<i>A</i>) and ruminants hosts (<i>H</i>). Each square represents a health state <i>X</i> in population <i>i</i> (<i>X</i>_<i>i</i>,) with <i>X = S</i> standing for susceptible, <i>E</i> for latent, <i>I</i> for infectious, and <i>R</i> for recovered and immune animals. The description, values and references for all parameters can be found in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0130838#pone.0130838.t001" target="_blank">Table 1</a>.