The Role of Migration in Maintaining the Transmission of Avian Influenza in Waterfowl: A Multisite Multispecies Transmission Model along East Asian-Australian Flyway

Figure 1

A schematic diagram of the multisite multispecies compartment model. Susceptible-Infectious-Susceptible (SIS) model was used, and population of each species at each site was classified as either susceptible or infectious; for example, S_1A (I_1A) represents the susceptible (infectious) compartment of species A at site 1. Variables beside the arrows show the rate of transition from one compartment to another (different notations from the main text may be used for generality). Pink-shaded areas indicate the mixing of hosts, reflecting our assumption that mixing can be cross-species but not cross-site. The force of infection is thus dependent on all the infectious compartments at the same site.