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Bayesian Development of a Dose‐Response Model for Aspergillus fumigatus and Invasive Aspergillosis

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  • Christopher Leleu
  • Jean Menotti
  • Pascale Meneceur
  • Firas Choukri
  • Annie Sulahian
  • Yves Jean‐François Garin
  • Jean‐Baptiste Denis
  • Francis Derouin

Abstract

Invasive aspergillosis (IA) is a major cause of mortality in immunocompromized hosts, most often consecutive to the inhalation of spores of Aspergillus. However, the relationship between Aspergillus concentration in the air and probability of IA is not quantitatively known. In this study, this relationship was examined in a murine model of IA. Immunosuppressed Balb/c mice were exposed for 60 minutes at day 0 to an aerosol of A. fumigatus spores (Af293 strain). At day 10, IA was assessed in mice by quantitative culture of the lungs and galactomannan dosage. Fifteen separate nebulizations with varying spore concentrations were performed. Rates of IA ranged from 0% to 100% according to spore concentrations. The dose‐response relationship between probability of infection and spore exposure was approximated using the exponential model and the more flexible beta‐Poisson model. Prior distributions of the parameters of the models were proposed then updated with data in a Bayesian framework. Both models yielded close median dose‐responses of the posterior distributions for the main parameter of the model, but with different dispersions, either when the exposure dose was the concentration in the nebulized suspension or was the estimated quantity of spores inhaled by a mouse during the experiment. The median quantity of inhaled spores that infected 50% of mice was estimated at 1.8 × 104 and 3.2 × 104 viable spores in the exponential and beta‐Poisson models, respectively. This study provides dose‐response parameters for quantitative assessment of the relationship between airborne exposure to the reference A. fumigatus strain and probability of IA in immunocompromized hosts.

Suggested Citation

  • Christopher Leleu & Jean Menotti & Pascale Meneceur & Firas Choukri & Annie Sulahian & Yves Jean‐François Garin & Jean‐Baptiste Denis & Francis Derouin, 2013. "Bayesian Development of a Dose‐Response Model for Aspergillus fumigatus and Invasive Aspergillosis," Risk Analysis, John Wiley & Sons, vol. 33(8), pages 1441-1453, August.
  • Handle: RePEc:wly:riskan:v:33:y:2013:i:8:p:1441-1453
    DOI: 10.1111/risa.12007
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    References listed on IDEAS

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    1. Peter Teunis & Katsuhisa Takumi & Kunihiro Shinagawa, 2004. "Dose Response for Infection by Escherichia coli O157:H7 from Outbreak Data," Risk Analysis, John Wiley & Sons, vol. 24(2), pages 401-407, April.
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