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Implementation of SIRS Infectious Disease Model in Small World Network.The model divides animal state into three categories: susceptible state (S), infectious state (I), and removal state (R). Animals in susceptible state will be infected by animals in infectious state with a certain probability in the process of contact with animals in infectious state; animals in infectious state can transmit disease to animals in contact with a certain probability; animals in infectious state will experience one. After a period of time, the patient recovers and no longer receives infection, and does not pose a threat to other animals, i.e. the state of being removed from the whole; after a period of time, the individual in the state of being removed recovers to a susceptible state. At the beginning, a certain proportion of animals were infected and the remaining animals were susceptible to infection.