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Birds Shed RNA-Viruses According to the Pareto Principle

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  • Mark D Jankowski
  • Christopher J Williams
  • Jeanne M Fair
  • Jennifer C Owen

Abstract

A major challenge in disease ecology is to understand the role of individual variation of infection load on disease transmission dynamics and how this influences the evolution of resistance or tolerance mechanisms. Such information will improve our capacity to understand, predict, and mitigate pathogen-associated disease in all organisms. In many host-pathogen systems, particularly macroparasites and sexually transmitted diseases, it has been found that approximately 20% of the population is responsible for approximately 80% of the transmission events. Although host contact rates can account for some of this pattern, pathogen transmission dynamics also depend upon host infectiousness, an area that has received relatively little attention. Therefore, we conducted a meta-analysis of pathogen shedding rates of 24 host (avian) – pathogen (RNA-virus) studies, including 17 bird species and five important zoonotic viruses. We determined that viral count data followed the Weibull distribution, the mean Gini coefficient (an index of inequality) was 0.687 (0.036 SEM), and that 22.0% (0.90 SEM) of the birds shed 80% of the virus across all studies, suggesting an adherence of viral shedding counts to the Pareto Principle. The relative position of a bird in a distribution of viral counts was affected by factors extrinsic to the host, such as exposure to corticosterone and to a lesser extent reduced food availability, but not to intrinsic host factors including age, sex, and migratory status. These data provide a quantitative view of heterogeneous virus shedding in birds that may be used to better parameterize epidemiological models and understand transmission dynamics.

Suggested Citation

  • Mark D Jankowski & Christopher J Williams & Jeanne M Fair & Jennifer C Owen, 2013. "Birds Shed RNA-Viruses According to the Pareto Principle," PLOS ONE, Public Library of Science, vol. 8(8), pages 1-9, August.
  • Handle: RePEc:plo:pone00:0072611
    DOI: 10.1371/journal.pone.0072611
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    References listed on IDEAS

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