### Abstract

We propose a numerical algorithm for a model of the spread of infection in the theory of epidemics. This model involves a threshold for becoming infective and leads to a system of delay-differential equations with the delay function which depends on the values of the unknowns over an interval. The numerical algorithm is based on diagonally implicit multistage integration formulas with stage order equal to the order of the method. This makes possible the efficient evaluation of past values to the accuracy compatible with the requested error tolerance. This algorithm is appicable to the general model without any simplifying assumptions on the parameters of the delay-differential system. Numerical results illustrate the effect of varying various parameters of the model on the spread of infection in a constant population.

Original language | English (US) |
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Pages (from-to) | 533-543 |

Number of pages | 11 |

Journal | Applied Numerical Mathematics |

Volume | 56 |

Issue number | 3-4 SPEC. ISS. |

DOIs | |

State | Published - Mar 1 2006 |

### Keywords

- Delay-differential system
- Numerical simulation
- Spread of infection
- Theory of epidemics

### ASJC Scopus subject areas

- Numerical Analysis
- Computational Mathematics
- Applied Mathematics

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## Cite this

*Applied Numerical Mathematics*,

*56*(3-4 SPEC. ISS.), 533-543. https://doi.org/10.1016/j.apnum.2005.04.019