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• W2000614957 abstract "Summary Host age is one of the most striking differences among hosts within most populations, but there is very little data on how age‐dependent effects impact ecological and evolutionary dynamics of both the host and the parasite. Here, we examined the influence of host age (juveniles, young and old adults) at parasite exposure on host susceptibility, fecundity and survival as well as parasite transmission, using two clones of the water flea D aphnia magna and two clones of its bacterial parasite P asteuria ramosa . Younger D. magna were more susceptible to infection than older ones, regardless of host or parasite clone. Also, younger‐infected D. magna became castrated faster than older hosts, but host and parasite clone effects contributed to this trait as well. Furthermore, the early‐infected D. magna produced considerably more parasite transmission stages than late‐infected ones, while host age at exposure did not affect virulence as it is defined in models (host mortality). When virulence is defined more broadly as the negative effects of infection on host fitness, by integrating the parasitic effects on host fecundity and mortality, then host age at exposure seems to slide along a negative relationship between host and parasite fitness. Thus, the virulence–transmission trade‐off differs strongly among age classes, which in turn affects predictions of optimal virulence. Age‐dependent effects on host susceptibility, virulence and parasite transmission could pose an important challenge for experimental and theoretical studies of infectious disease dynamics and disease ecology. Our results present a call for a more explicit stage‐structured theory for disease, which will incorporate age‐dependent epidemiological parameters." @default.
• W2000614957 created "2016-06-24" @default.
• W2000614957 creator A5026960238 @default.
• W2000614957 creator A5038372931 @default.
• W2000614957 date "2015-03-18" @default.
• W2000614957 modified "2023-10-02" @default.
• W2000614957 title "Host age modulates parasite infectivity, virulence and reproduction" @default.
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