FIG. 1.

Estimated mean annual attributed Salmonella cases versus observed annual attributable cases by serotype and year of study. The dotted line represents a least squares fit constrained to pass through the point (0, 0). The slope of the fitted line is 0.73, which suggests that, at the level of serotype and year, 73% of observed cases are attributed to commodity. The inset reveals a lack of fit with respect to this relationship and the data, with serotypes having lower counts showing a generally lower percentage of observed cases attributed to commodity. Color images are available online at www.liebertonline.com/fpd