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IAS(r) Influenza-like illness
IAS(r) Influenza-like illness
Sébastien GUICHARD avatar
Written by Sébastien GUICHARD
Updated over a week ago

IAS(r) available on the website


The aim of the 'Flu Syndrome' Advanced Health Indicator (AHI®) is to contribute to the monitoring of flu syndromes in France by providing information that complements that of the Sentinelles and Grog networks. The model used for the 'Flu Syndrome' IAS® is based on the monitoring of a set of drugs prescribed in cases of suspected seasonal flu in France, and uses the analysis and representation methods developed by OpenHealth. This indicator is highly correlated with data from the Sentinelles network. The IAS® is calculated each day using a temporal smoothing method: information from the previous seven days and the following seven days is taken into account to calculate the value for a given day.


For each of the IAS®, these are weighted baskets of medicines and healthcare products dispensed over the counter in pharmacies and pathology markers.

These market definitions have been the subject of research and are regularly reviewed to take account of changes in product scope and practices.

As this is our intellectual property, we cannot provide access to these details.

OpenHealth The HUB - PHARMA: consumption data from pharmacies
Drug database source: SIPS THESORIMED
Source WHO ATC Classification: WHO ATC Version 2020

Metropolitan France - excluding Corsica
Geographical breakdown: French administrative regions as at 01/01/2016

From 01/07/2014 to date

Market definition
Type: Human medicine according to WHO ATC class code assignments - 2020 version - from the THESORIMED source.

Illustration at 04/01/2023:

Threshold :

Cases per 100,000 inhabitants per day.

National: 98.8

> 350 Level 4 - epidemic phase

35 - 350 Level 3 - pre (or post) epidemic phase

3,5 - 35Level 2 - non-alert phase

< 3.5 Level 1 - reference

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