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Table 1

Stochastic QMRA model parameters for E. coli O157:H7

Stochastic parameterMeanDistribution/commentsReferences
Numbers per 100 mL (mon) Min = 4,300, Max = 93,000 Uniform Dash et al. (2010)  
Numbers per 100 mL (non-mon) μ = 4,297.5, σ = 2,908.8 Log-normal, truncated at 0 Saini (2011)  
E. coli fraction of TTC Min = 0.84, Max = 1.04 Uniform Hamilton et al. (2005)  
Pathogenic fraction of E. coli Min = 0.07, Max = 0.09 Uniform Haas et al. (1999)  
RBF removal (mon) Min = 2, Max = 4.4, Mode = 3 Triangular Max by Dash et al. (2010)  
RBF removal (non-mon) Min = 2, Max = 3.5, Mode = 3 Triangular Max by Dash et al. (2010)  
Removal through disinfection Min = 0, Max = 3, Mode = 0 Triangular Sandhu (2014)  
Ingestion in L/d μ = 3.12, σ = 1.17 Normal Hossain et al. (2012)  
Dose–response λ = 0.49, β = 1.9 × 105 Beta-Poisson Haas et al. (2000)  
Ratio of illness/infection 0.25 Based on Shigella Haas et al. (1999)  
Disease burden per case 0.46 Mortality based on Shigella Havelaar & Melse (2003)  
Stochastic parameterMeanDistribution/commentsReferences
Numbers per 100 mL (mon) Min = 4,300, Max = 93,000 Uniform Dash et al. (2010)  
Numbers per 100 mL (non-mon) μ = 4,297.5, σ = 2,908.8 Log-normal, truncated at 0 Saini (2011)  
E. coli fraction of TTC Min = 0.84, Max = 1.04 Uniform Hamilton et al. (2005)  
Pathogenic fraction of E. coli Min = 0.07, Max = 0.09 Uniform Haas et al. (1999)  
RBF removal (mon) Min = 2, Max = 4.4, Mode = 3 Triangular Max by Dash et al. (2010)  
RBF removal (non-mon) Min = 2, Max = 3.5, Mode = 3 Triangular Max by Dash et al. (2010)  
Removal through disinfection Min = 0, Max = 3, Mode = 0 Triangular Sandhu (2014)  
Ingestion in L/d μ = 3.12, σ = 1.17 Normal Hossain et al. (2012)  
Dose–response λ = 0.49, β = 1.9 × 105 Beta-Poisson Haas et al. (2000)  
Ratio of illness/infection 0.25 Based on Shigella Haas et al. (1999)  
Disease burden per case 0.46 Mortality based on Shigella Havelaar & Melse (2003)  

Mon, monsoon season; non-mon, non-monsoon season; μ, mean; σ, standard deviation; λ & β, Beta distribution parameters.

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