Key Points

Chikungunya, Dengue, and Zika

• Since May 1, 2026, 115 imported cases of dengue, 33 imported cases of chikungunya, and 2 imported cases of Zika have been identified and investigated in the Île-de-France region.
• In the Île-de-France region, the first outbreak of locally transmitted chikungunya was identified in Nogent-sur-Marne in Val-de-Marne (94), with 6 cases identified to date.

West Nile Virus Infections

• As of October 11, 2026, 25 locally acquired human cases of West Nile virus (WNV) infection have been identified in the Île-de-France region, including 14 neuroinvasive cases and 4 deaths.

COVID-19

• Emergency department visits: After five weeks of increases around the start of the school year, the number of emergency department visits for suspected COVID-19 has been declining since Week 40. 
• SOS Médecins: The number of procedures for suspected COVID-19 was decreasing in Week 41.

Bronchiolitis 

• In hospitals, during Week 41, activity related to bronchiolitis has remained stable since Week 38.
• In community settings, the number of consultations for bronchiolitis was decreasing between Week 41 and Week 40 for SOS Médecins associations, with a limited number of cases.

Influenza 

• The number of healthcare visits and the proportion of cases related to flu-like syndromes remained stable in emergency departments (OSCOUR®) and in private practice (SOS Médecins) over the past 4 weeks.