Weekly Influenza-Like Illness (ILI) Activity Level Indicator determined by data reported to the Emergency Department Syndromic Surveillance System supported by the Ministry of Health and Long Term Care and based at KFLA Public Health. Click here for a list of health unit and hospital partners.

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Flu Season Week
Mar. 20, 2014

Seasonal Influenza Risk Assessment Process

From November to April, the Ministry of Health and Long-Term Care reviews a set of indicators on a weekly basis to assess how the province is progressing through the influenza season. These indicators include data from syndromic and laboratory surveillance systems, as well as health system utilization data.

The ministry is piloting a classification system to describe influenza activity and to support decision-making by health organizations. Over the course of the 2013/2014 influenza season, the classification system will be validated for future improvements. This system describes influenza activity according to a green, yellow, orange and red colour scheme :

Green - Influenza-related activity is at low seasonal levels.

No significant increases in influenza activity are expected this week.

Yellow - Influenza-related activity is at elevated seasonal levels.

This week influenza is expected to increase as part of a seasonal peak in activity or decrease from a seasonal peak.

Orange - Influenza-related activity is at elevated seasonal levels and may be reaching peak levels this week.

Red - Influenza-related activity is at greatly elevated levels.

For more information about this project piloting a classification system to describe influenza activity, please contact the ministry's Emergency Management Branch by email at emergencymanagement.moh@ontario.ca or by phone at 1-866-212-2272.

Additional Info

The analysis is done on the data provided in real time to the EDSS system from hospital partners. The data is analyzed weekly on each Thursday on the data available up to that day. The map is produced for viewing on the next day.

The epidemic curves for the provincial summary of data are here: