The Distribute system was initially designed to share 4 syndromes (broad and narrow ILI, and GI syndromes). To reduce barriers to entry, the Distribute project does not impose strict syndrome definitions. This lack of standardization introduces variability between jurisdictions and a pilot has been undertaken to compare sites with preferred definitions and to develop a common ILI definition. To enable the addition of a common syndrome considerable modifications to the structure of the Distribute system were required. The approach taken allowed for the use of arbitrary indicators and stratification ranges.