Health Surveillance in Brittany. Bulletin dated September 4, 2026.
Key Points
Extreme Heat, Heat Wave
- The seasonal monitoring system is active from June 1 through September 15 each year. Brittany has been on a green alert since the last heatwave in August. Indicators have continued to decline since the last heatwave.
- Prevention resources for the general public and healthcare professionals are available for order or download on the Santé publique France website.
Asthma
- Activity remains stable at a low level. Within seasonal norms.
Allergies
- The number of emergency room visits remains stable, while the number of SOS Médecins consultations has decreased. Case numbers are in line with seasonal averages.
Gastroenteritis
- Low activity. Decrease in emergency department visits and SOS Médecins consultations across all age groups.
ENT Conditions
- Low activity since the summer. Activity related to ENT conditions has remained stable in S35: among children under 5, ENT conditions account for 6.2% of emergency department visits and 43.8% of SOS Médecins consultations. Low detection rates of rhinoviruses and enteroviruses by the virology laboratories at the Rennes and Brest university hospitals (positivity rates of 11.4% (4/35) and 10.5% (9/86), respectively).
In relation to
Extreme heat, heat wave
thematic dossier
Heat waves can have a significant impact on health. It is therefore essential to take proper precautions. Certain measures must be put in place, especially for those most at risk.
Asthma
thematic dossier
Asthma is a chronic respiratory disease characterized by attacks, which are episodes of breathing difficulties (dyspnea). Asthma has a significant impact on patients’ quality of life.
Acute gastroenteritis
thematic dossier
Acute winter gastroenteritis is often caused by viruses. Every year, there is a surge in cases in France, as in the rest of Europe, leading to an increase in medical consultations for acute winter...
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