Health Surveillance in Brittany. Bulletin of January 16, 2026.

Key points

Bronchiolitis (under 1 year of age)

  • Post-epidemic activity. Decrease in visits to hospital emergency rooms and SOS Médecins consultations. Virology laboratories at the region’s university hospitals report a decrease in RSV detection in Rennes and stable levels in Brest.

  • Other viruses capable of causing bronchiolitis are circulating, notably rhinoviruses.

COVID-19

  • Low activity.

Influenza and influenza-like illness

  • Epidemic activity. Decrease in the number of emergency room visits and a slight increase in the number of SOS Médecins consultations for influenza and influenza-like illness. Cases are on the rise among children (SOS Médecins) and declining among those aged 65 and older. An increase in the detection of influenza A virus according to data from the Virology Laboratories at Rennes University Hospital and a decrease in detection according to data from Brest University Hospital.

Gastroenteritis

  • High activity. Increase in the number of SOS Médecins consultations and emergency room visits across all age groups.

ENT conditions

  • High activity. In S02, among children under 5, ENT conditions accounted for 9.2% of emergency room visits (compared to 13% in S01) and 38.2% of SOS Médecins consultations (compared to 51.4% in S01). Decrease in the detection rate of rhinoviruses/enteroviruses by the virology laboratories at Rennes University Hospital (positivity rate of 6.1% in S02 compared to 12.4% in S01) and Brest University Hospital (positivity rate of 6.3% compared to 9.9% in S01).

Pneumonias

  • Decrease in emergency room visits and SOS Médecins consultations for pneumonia among adults.

Asthma

  • High activity. Decrease in SOS Médecins consultations (among adults) and decrease in emergency department visits (particularly among children), all ages.

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