Fig 1.
Boxplot of log10 reduction in Salmonella cell counts in washing water.
(A) plastic, (B) nylon, (C) rubber, and (D) wood substrates contaminated with Salmonella Typhimurium-Choleraesuis and treated with 50 mL of 200 ppm sodium hypochlorite (NaOCl), 9 ppm of aqueous ozone (aqueous-O3), or 400 ppm peracetic acid (PAA) for 4 minute exposure. The horizontal dashed red line indicates the safe level reduction (5-log10). The blue diamond indicates the posterior mean. The light blue shapes indicates the violin density plot.
Fig 2.
Boxplot of log10 reduction in Salmonella cell count on substrate surfaces.
(A) plastic, (B) nylon, (C) rubber, and (D) wood substrates contaminated with Salmonella Typhimurium-Choleraesuis and treated with 50 mL of 200 ppm sodium hypochlorite (NaOCl), 9 ppm of aqueous ozone (aqueous-O3), or 400 ppm peracetic acid (PAA) for 4 minute exposure. The horizontal dashed red line indicates the safe level reduction (5-log10). The blue diamond indicates the posterior mean. The light blue shapes indicates the violin density plot.
Fig 3.
The killig capacity ratio of sodium hypochlorite (NaOCl), aqueous ozone (aqueous-O3), and peracetic acid (PAA) biocides on various materials (plastic, nylon, rubber, wood) contaminated with Salmonella Typhimurium-Choleraesuis (aSTC).
(A) in washing water (B) on material surfaces. The average aSTC load related to the size of light blue outer circles. The average aSTC kill percentages related to the size of inner circles. The 5-log10 reduction related to the shading of the circle (blue circle = > 5-log10, orange circle = < 5-log10).
Table 1.
Estimated parameters of Bayesian model for predicting log10 reduction in Salmonella Typhimurium-Choleraesui population in washing water of sodium hypochlorite (NaOCl), aqueous ozone (aqueous-O3), and peracetic acid (PAA) biocides applied for various surfaces (plastic, nylon, rubber, and wood).
Table 2.
Estimated parameters of Bayesian model for predicting log10 reduction in Salmonella Typhimurium-Choleraesuis on surface of plastic, nylon, rubber, and wood substrates washed with sodium hypochlorite (NaOCl), aqueous ozone (aqueous-O3), and peracetic acid (PAA) biocides.
Table 3.
Washing solution and surface swabbing model comparisons according to deviance information criterion (DIC).
Fig 4.
Scatterplot of the linear relationship between materials (surface complexity) contaminated with Salmonella Typhimurium-Choleraesuis and rate of bacterial reduction of sodium hypochlorite (A), aqueous ozone (B), and peracetic acid (C). The solid blue line is the regression line calculated from the posterior predictive distributions, the shaded region indicates 95% credible interval, and the yellow line is the 95% posterior predicative intervals. The horizontal dashed red line indicates 5-log10 reduction.
Fig 5.
Posterior density plots of the slope coefficients of sodium hypochlorite (A), aqueous ozone (B), and peracetic acid (C) obtained from the fitted Bayesian linear regression models using the type of surface as a predictor for Salmonella Typhimurium-Choleraesuis reduction. Three different colors of the density curves indicate the number of chains. The density plot away from zero indicates the significance of the effect, where zero indicates no effect of surface type on the killing power of the disinfectant.
Table 4.
Bayesian linear regression model for the association between log10 reduction rate in Salmonella Typhimurium-Choleraesui population and materials.