A query with the stringˆvomitˆ, or,ˆdiarrheaˆ, or,ˆgastroenter-itisˆ(VDG) was performed in the Electronic Surveillance System for Early Notification of Community-based Epidemics (ES-SENCE) during a 7-day period surrounding the 10 Federal Holidays of each year of the quadrennial 2007Á2010. The count of ED patients during the 7-day period was compared to the count of a 28-day background by calculating a ratio between the 2 periods for both, the 4-year average and year-specific. The analysis was broken down by age groups (0Á4, 5Á17, 18Á64, 65 and plus and all-age). Database analysis was conducted using SAS 9.2.