Figure 1

Salmonella Enteritidis infections, by symptom onset month and percent travel-related July 2010 to June 2011. *Data are incomplete for November 2010 and January 2011, given the study period start and end dates. The total number of eligible cases includes both interviewed cases (n = 624) and cases lost to follow-up (n = 202). Symptom onset dates are estimated for lost to follow-up cases based on the mean delay (12 days) from symptom onset date to laboratory received date for interviewed cases. The percent travel cases by month was calculated by dividing the number of TR cases by the number of interviewed cases per month.