Research output

Article in Journal ()

The evolution of costly acquired immune memory

Citation
Best A & Hoyle A (2013) The evolution of costly acquired immune memory, Ecology and Evolution, 3 (7), pp. 2223-2232.

Abstract
A key feature of the vertebrate adaptive immune system is acquired immune memory, whereby hosts launch a faster and heightened response when challenged by previously encountered pathogens, preventing full infection. Here, we use a mathematical model to explore the role of ecological and epidemiological processes in shaping selection for costly acquired immune memory. Applying the framework of adaptive dynamics to the classic SIR (Susceptible-Infected-Recovered) epidemiological model, we focus on the conditions that may lead hosts to evolve high levels of immunity. Linking our work to previous theory, we show how investment in immune memory may be greatest at long or intermediate host lifespans depending on whether immunity is long lasting. High initial costs to gain immunity are also found to be essential for a highly effective immune memory. We also find that high disease infectivity and sterility, but intermediate virulence and immune period, increase selection for immunity. Diversity in host populations through evolutionary branching is found to be possible but only for a limited range of parameter space. Our model suggests that specific ecological and epidemiological conditions have to be met for acquired immune memory to evolve.

Keywords
Acquired immunity; host-parasite; immune memory; SIR

StatusPublished
AuthorsBest Alex, Hoyle Andrew
Publication date07/2013
Publication date online06/06/2013
Date accepted by journal24/04/2013
PublisherWiley-Blackwell
ISSN 2045-7758
LanguageEnglish

Journal
Ecology and Evolution: Volume 3, Issue 7

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