ARI are caused by a variety of respiratory viruses including SARS-CoV-2 (Covid-19), influenza viruses, and other respiratory viruses such as RSV, rhinovirus, and metapneumovirus. The purpose of ARI surveillance is to monitor outbreaks of these viruses.
 
In mainland France, last week (2025w51), the incidence rate of acute respiratory infection (ARI) cases consulting in general practice was estimated at 348 cases per 100,000 population (95% CI [336; 359]).
Subject to future data consolidation, this rate continues the increase observed in recent weeks and corresponds to a similar level of activity to those usually observed at this time of the year (consolidated data for 2025w50: 299 [289; 310]).

At the regional level, the highest incidence rates were noted in: Nouvelle-Aquitaine (596 [544; 648]), Bretagne (547 [487; 607]) and Provence-Alpes-Côte d’Azur (480 [429; 532]). 

Influenza: the incidence rate of influenza cases seen in general practice for an ARI was estimated at 234 cases per 100,000 population (95% CI [205; 263]) (data sources: Sentinelles, SOS Médecins, Rouen, Côte d’Azur and Strasbourg Universities).
Subject to future data consolidation, this rate continues the sharp increase observed over the past three weeks (among children and adults) (consolidated data for 2025w50:  155 [137; 173]) and corresponds to a moderate level of activity.

RSV infection: the incidence rate of RSV infection cases seen in general practice for an ARI was estimated at 52 cases per 100,000 population (95% CI [38; 67]) (data sources: Sentinelles, SOS Médecins, Rouen, Côte d’Azur and Strasbourg Universities).
Subject to future data consolidation, this rate is increasing (among children and adults) (consolidated data for 2025w50: 34 [25; 43]) and corresponds to a high level of activity.

Bronchiolitis in children under one year old : the incidence rate of bronchiolitis cases in children under 1 seen in general practice was estimated at 404 cases per 100,000 population (95% CI [248; 560]) (data source: IQVIA (EMR)).
Subject to future data consolidation, this rate is stable (consolidated data for 2025w50: 476 [311; 641]) and corresponds to a lower activity level than those usually observed at this time of the year.

Covid-19: the incidence rate of Covid-19 cases seen in general practice for an ARI was estimated at 11 cases per 100,000 population (95% CI [8; 14]) (data source: Sentinelles).
Subject to future data consolidation, this rate is stable (consolidated data for 2025w50: 8 [6; 10]) and corresponds to a low level of activity.

The purpose of acute diarrhea surveillance is to monitor gastroenteritis outbreaks.

In mainland France, last week (2025w51), the incidence rate of acute diarrhea cases seen in general practice was estimated at 72 cases per 100,000 population (95% CI [67; 77]). 
Subject to future data consolidation, this rate is stable compared to the previous weeks and corresponds to a lower level of activity than those usually observed at this time of the year (consolidated data for 2025w50: 74 [69; 79]).

At the regional level, the highest incidence rates were noted in: Corse (105 [45; 164]), Grand Est (104 [83; 125]) and Nouvelle-Aquitaine (103 [81; 124]).

Data sources: Sentinelles and Electronic Medical Records (EMR) IQVIA

In mainland France, last week (2025w51), the incidence rate of Chickenpox cases seen in general practice was estimated at 12 cases per 100,000 population (95% CI [10; 14]). 
Subject to future data consolidation, this rate is stable compared to the previous week and corresponds to a similar level of activity to those usually observed at this time of the year (consolidated data for 2025w50: 13 [11; 15]).

At the regional level, the highest incidence rates were noted in: Corse (36 [0; 74]), Pays de la Loire (24 [10; 39]) and Centre-Val de Loire (19 [4; 34]).

Data sources: Sentinelles and Electronic Medical Records (EMR) IQVIA