# Figures—2013 Preliminary Data

FoodNet uses a main-effects, log-linear Poisson regression (negative binomial) model to estimate changes in the incidence of infection. The model adjusts for the increase in the number of FoodNet sites since 1996 and for variation in the incidence of infections among sites. The average annual incidence for 1) 1996–1998 (1997–1998 for *Cryptosporidium*), the first years of surveillance, 2) a more recent 3-year period (2006–2008), and 3) the preceding 3 years (2010–2012) are used for comparisons. The model is used to calculate the estimated change in incidence (relative rate) between 2013 and the comparison periods, with 95% confidence intervals (CI). In the figures that report percentage change, the percentage change for the current year is calculated by comparison with the appropriate comparison period and graphed along with the 95% confidence interval. In the figures that report relative rate, the relative rate for each year is graphed. For STEC non-O157, only change since 2010–2012 was assessed because diagnostic practices changed before then; for *Cyclospora*, change was not assessed because data were sparse.

FoodNet also uses the negative binomial model to measure overall trends in incidence. In this model, data for *Campylobacter*, *Listeria*, *Salmonella*, STEC O157, *Vibrio*, and *Yersinia*, the bacterial pathogens for which >50% of illnesses are estimated to be transmitted by food, are combined, weighting them by incidence of infection for each pathogen.

## Figure 1. Percentage change in incidence^{*} of culture-confirmed bacterial and laboratory-confirmed parasitic infections in 2013^{†} compared with average annual incidence during 1996–1998, by pathogen, FoodNet

^{*}The estimates and confidence intervals presented indicate the relative change in the incidence of that pathogen compared with 1996–1998. The actual incidences of these infections
cannot be determined from the graph.

^{†}Data are preliminary

^{§}*No significant change* = 95% confidence interval is both above and below the no change line; *significant increase* = estimate and entire 95% confidence interval are above the no change
line; *significant decrease* = estimate and entire 95% confidence interval are below the no change line

^{¶}Shiga toxin-producing *Escherichia coli*

## Figure 2. Relative rates of culture-confirmed infections with *Campylobacter*, STEC^{*} O157, *Listeria*, *Salmonella*, and *Vibrio* compared with 1996–1998 rates, by year, FoodNet 1996–2013^{†}

^{*}Shiga toxin-producing *Escherichia coli*

^{†}The position of each line indicates the relative change in the incidence of that pathogen compared with 1996–1998. The actual incidences of these infections cannot be determined from this graph.
Data for 2013 are preliminary.

## Figure 3. Relative rates of culture-confirmed infections with *Shigella* and *Yersinia*, and laboratory-confirmed infections with *Cryptosporidium* compared with 1996–1998 rates, by year, FoodNet 1996–2013^{*}

^{*}The position of each line indicates the relative change in the incidence of that pathogen compared with 1996–1998. The actual incidences of these infections cannot be
determined from this graph. Data for 2013 are preliminary.

## Figure 4. Percentage change in incidence^{*} of culture-confirmed bacterial and laboratory-confirmed parasitic infections in 2013^{†} compared with average annual incidence during 2006–2008, by pathogen, FoodNet

^{*}The estimates and confidence intervals presented indicate the relative change in the incidence of that pathogen compared with 2006–2008. The actual incidences of these infections cannot be determined from the graph.

^{†}Data are preliminary

^{§}*No significant change* = 95% confidence interval is both above and below the no change line; *significant increase* = estimate and entire 95% confidence interval are above the no change line; *significant decrease* = estimate and entire 95% confidence interval are below the no change line

^{¶}Shiga toxin-producing *Escherichia coli*

## Figure 5. Relative rates of culture-confirmed infections with *Campylobacter*, STEC^{*} O157, *Listeria*, *Salmonella*, and *Vibrio* compared with 2006–2008 rates, by year, FoodNet 2006–2013^{†}

^{*}Shiga toxin-producing *Escherichia coli* ^{
†}The position of each line indicates the relative change in the incidence of that pathogen compared with 2006–2008. The actual incidences of these infections cannot be determined from this graph.
Data for 2013 are preliminary.

## Figure 6. Relative rates of culture-confirmed infections with *Shigella*, *Yersinia*, and laboratory-confirmed infections with *Cryptosporidium* compared with 2006–2008 rates, by year, FoodNet 2006–2013^{*}

^{*}The position of each line indicates the relative change in the incidence of that pathogen compared with 2006–2008. The actual incidences of these infections cannot be
determined from this graph. Data for 2013 are preliminary.

## Figure 7. Percentage change in incidence^{*} of culture-confirmed bacterial and laboratory-confirmed parasitic infections in 2013^{†} compared with average annual incidence during 2010–2012, by pathogen, FoodNet

^{*}The estimates and confidence intervals presented indicate the relative change in the incidence of that pathogen compared with 2010–2012. The actual incidences of these infections cannot be determined from the graph.

^{†}Data are preliminary

^{§}*No significant change* = 95% confidence interval is both above and below the no change line; *significant increase* = estimate and entire 95% confidence interval are above the no change
line; *significant decrease* = estimate and entire 95% confidence interval are below the no change line

^{¶}Shiga toxin-producing *Escherichia coli*

## Figure 8. Percentage change in incidence^{*} of culture-confirmed *Salmonella* infections with the top *Salmonella* serotypes in 2013^{†} compared with average annual incidence during 1996–1998, by serotype, FoodNet

^{*}The estimates and confidence intervals presented indicate the relative change in the incidence of that serotype compared with 1996–1998. The actual incidences of these infections cannot be determined from the graph.

^{†}Data are preliminary. Percentage change was not evaluated for serotypes Javiana and I 4,[5],12:i:-.

^{§}*No significant change* = 95% confidence interval is both above and below the no change line; *significant increase* = estimate and entire 95% confidence interval are above the no change line; *significant decrease* = estimate and entire 95% confidence interval are below the no change line

## Figure 9. Relative rates of culture-confirmed *Salmonella* infections with the top *Salmonella* serotypes in 2013^{*} compared with 1996–1998 rates, by year, FoodNet 1996–2013^{†}

^{*}Data for 2013 are preliminary. *Salmonella* serotypes included are: Enteritidis, Typhimurium, Newport, and Heidelberg. Changes over time for serotypes Javiana and I 4,[5],12:i:-
were not evaluated.

^{†}The position of each line indicates the relative change in the incidence of that serotype compared with 1996–1998. The actual incidences of these infections cannot be
determined from this graph.

## Figure 10. Relative rates of culture-confirmed *Salmonella* infections with the top *Salmonella* serotypes in 2013^{*} compared with 1996–1998 rates, by year, FoodNet 1996–2013^{†}

^{*}Data for 2013 are preliminary. *Salmonella* serotypes included are: Saintpaul, Infantis, Muenchen, and Oranienburg. Changes over time for serotypes Javiana and I 4,[5],12:i:-
were not evaluated.

^{†}The position of each line indicates the relative change in the incidence of that serotype compared with 1996–1998. The actual incidences of these infections cannot be
determined from this graph.

## Figure 11. Percentage change in incidence^{*} of culture-confirmed *Salmonella* infections with the top *Salmonella* serotypes in 2013^{†} compared with average annual incidence during 2006–2008, by serotype, FoodNet

^{*}The estimates and confidence intervals presented indicate the relative change in the incidence of that serotype compared with 2006–2008. The actual incidences of these infections cannot be determined from the graph.

^{†}Data are preliminary

^{§}*No significant change* = 95% confidence interval is both above and below the no change line; *significant increase* = estimate and entire 95% confidence interval are above the no change line;* significant* decrease = estimate and entire 95% confidence interval are below the no change line

## Figure 12. Relative rates of culture-confirmed *Salmonella* infections with the top *Salmonella* serotypes in 2013^{*} compared with 2006–2008 rates, by year, FoodNet 2006–2013^{†}

^{*}Data for 2013 are preliminary. *Salmonella* serotypes included are: Enteritidis, Typhimurium, Newport, Javiana, and I 4,[5],12:i:-.

^{†}The position of each line indicates the relative change in the incidence of that serotype compared with 2006–2008. The actual incidences of these infections cannot be
determined from this graph.

## Figure 13. Relative rates of laboratory-confirmed *Salmonella* infections with the top *Salmonella* serotypes in 2013^{*} compared with 2006–2008 rates, by year, FoodNet 2006–2013^{†}

^{*}Data for 2013 are preliminary. *Salmonella* serotypes included are: Heidelberg, Saintpaul, Infantis, Muenchen, and Oranienburg.

^{†}The position of each line indicates the relative change in the incidence of that serotype compared with 2006–2008. The actual incidences of these infections cannot be
determined from this graph.

## Figure 14. Percentage change in incidence^{*} of laboratory-confirmed *Salmonella* infections with the top *Salmonella* serotypes in 2013^{†} compared with average annual incidence during 2010–2012, by serotype, FoodNet

^{*}The estimates and confidence intervals presented indicate the relative change in the incidence of that serotype compared with 2010–2012. The actual incidences of these infections cannot be determined from the graph.

^{†}Data are preliminary

^{§}*No significant change* = 95% confidence interval is both above and below the no change line; *significant increase* = estimate and entire 95% confidence interval are above the no change line;
significant decrease = estimate and entire 95% confidence interval are below the no change line

## Figure 15. Relative rates of culture-confirmed infections with *Campylobacter*, STEC^{*} O157, *Listeria*, *Salmonella*, *Vibrio*, and *Yersinia*, and overall measure of change, compared with 1996–1998 rates, by year, FoodNet 1996–2013^{†}

^{*}Shiga toxin-producing *Escherichia coli*

^{†}The position of each line indicates the relative change in the incidence of that pathogen compared with 1996–1998. The actual incidences of these infections cannot be
determined from this graph. Data for 2013 are preliminary.

^{§}The measure of overall trends in incidence combines data for *Campylobacter*, *Listeria*, *Salmonella*, STEC O157, *Vibrio*, and *Yersinia*, the six key bacterial pathogens for which
>50% of illnesses are estimated to be transmitted by food. The model weights by incidence of infection for each pathogen.

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