Seasonality and the Coexistence of Pathogen Strains
Seasonality and the Coexistence of Pathogen Strains
复制标题
季节性和病原体菌株的共存
DOI:
10.1086/723490
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发表时间:
2023
期刊:
影响因子:
--
通讯作者:
Dwyer, Greg
中科院分区:
文献类型:
--
作者:
Andreasen, Viggo;Dwyer, Greg
Host-pathogen models usually explain the coexistence of pathogen strains by invoking population structure, meaning host or pathogen variation across space or individuals; most models, however, neglect the seasonal variation typical of host-pathogen interactions in nature. To determine the extent to which seasonality can drive pathogen coexistence, we constructed a model in which seasonal host reproduction fuels annual epidemics, which are in turn followed by interepidemic periods with no transmission, a pattern seen in many host-pathogen interactions in nature. In our model, a pathogen strain with low infectiousness and high interepidemic survival can coexist with a strain with high infectiousness and low interepidemic survival: seasonality thus permits coexistence. This seemingly simple type of coexistence can be achieved through two very different pathogen strategies, but understanding these strategies requires novel mathematical analyses. Standard analyses show that coexistence can occur if the competing strains differ in terms ofR0, the number of new infections per infectious life span in a completely susceptible population. A novel mathematical method of analyzing transient dynamics, however, allows us to show that coexistence can also occur if one strain has a lowerR0than its competitor but a higher initial fitness λ0, the number of new infections per unit time in a completely susceptible population. This second strategy allows coexisting pathogens to have quite similar phenotypes, whereas coexistence that depends on differences inR0values requires that coexisting pathogens have very different phenotypes. Our novel analytic method suggests that transient dynamics are an overlooked force in host-pathogen interactions.
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影响因子:
3.2
作者:
Van Den Berg F
通讯作者:
Van Den Berg F
DOI:
--
发表时间:
2020
期刊:
International Journal of Parasitology
影响因子:
--
作者:
R. Poulin
通讯作者:
R. Poulin
影响因子:
2.6
作者:
S. Prati;E. Henriksen;R. Knudsen;P. Amundsen
通讯作者:
P. Amundsen
影响因子:
16.8
作者:
Leggett, Helen C.;Buckling, Angus;Boots, Mike
通讯作者:
Boots, Mike
DOI:
--
发表时间:
1979
期刊:
影响因子:
--
作者:
C. Thompson;D. Scott
通讯作者:
D. Scott