Figure 3

A, The schematic representation of the model used in our simulations. The map shows the land area of South Korea segmented into 76, 1 × 1 unit squares (1 unit = 37.5 Km). The different color schemes represent the area of different provinces. B, Schematic representation of how an individual farm (a group of chickens or ducks) from the AI susceptible state (S) into incubation status (I) for the 2-17 day period (varies for chickens and ducks). In this status, a farm could transfer a virus without evidence of infection. After the period of incubation, it moves into activation status (A) where it could die by death probability of infected birds. C, γ is the infection spreading distance between poultry flocks and λ, is the radius of culling area from a center of infected poultry flocks.