Computing R_(0) of dynamic models by a definition-based method  

作　　者：Xiaohao Guo Yichao Guo Zeyu Zhao Shiting Yang Yanhua Su Benhua Zhao Tianmu Chen 

机构地区：[1]State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics,School of Public Health,Xiamen University,Xiamen City,361102,Fujian Province,People's Republic of China [2]Universite de Montpellier,CIRAD,Intertryp,IES,Universite de Montpellier-CNRS,Montpellier,France

出　　处：《Infectious Disease Modelling》2022年第2期196-210,共15页传染病建模（英文）

基　　金：supported by the Bill&Melinda Gates Foundation(INV-005834);The National Key Research and Development Program of China(2021YFC2301604);the research project on education and teaching reform of undergraduate universities of Fujian Province,China(FBJG20210260).

摘　　要：Objectives:Computing the basic reproduction number(R0)in deterministic dynamical models is a hot topic and is frequently demanded by researchers in public health.The nextgeneration methods(NGM)are widely used for such computation,however,the results of NGM are usually not to be the true R0 but only a threshold quantity with little interpretation.In this paper,a definition-based method(DBM)is proposed to solve such a problem.Methods:Start with the definition of R0,consider different states that one infected individual may develop into,and take expectations.A comparison with NGM has proceeded.Numerical verification is performed using parameters fitted by data of COVID-19 in Hunan Province.Results:DBM and NGM give identical expressions for single-host models with single-group and interactive Rij of single-host models with multi-groups,while difference arises for models partitioned into subgroups.Numerical verification showed the consistencies and differences between DBM and NGM,which supports the conclusion that R0 derived by DBM with true epidemiological interpretations are better.Conclusions:DBM is more suitable for single-host models,especially for models partitioned into subgroups.However,for multi-host dynamic models where the true R0 is failed to define,we may turn to the NGM for the threshold R0.

关 键 词：Definition-based method Dynamics model Basic reproduction number Next-generation method 

分 类 号：O313[理学—一般力学与力学基础]