Human host population is assumed to be constant during the epidemic outbreak, given the brief duration of the epidemic compared to the lifespan of humans. We indicate with N h~3 968 the number of humans [1] . As for the epidemic transmission model, hosts are classified as susceptible (S h ), latent (E h ), infectious symptomatic (I s h ) or asymptomatic (I a h ), and recovered (R h ). As only adult female mosquitoes are responsible for virus transmission, adult males are not explicitly represented in the transmission model. Female adult vectors are classified as susceptible (A), latent (A e ) and infectious (A i ). A susceptible vector enters the latent class after biting an infectious host at the per capita rate kx v , where k represents the biting rate of the vector (i.e., the number of bites to humans per mosquito per day) and x v is the susceptibility to infection of the vectors (i.e., the probability that a mosquito get infected after biting an infectious host). A latent vector enters the infectious class after an average latent period of 1=v v days and remains infectious for the rest of its life [26] . Thus, to account for the epidemic transmission process, the 4th Eq. of system (1) is replaced by the following three equations: