Key Points

Chikungunya, Dengue, and Zika

Since May 1, 2026, the following have been identified:

• 123 imported cases of dengue
• 34 imported cases and 3 locally acquired cases of chikungunya
• 2 imported cases of Zika

West Nile Virus Infections

• As of October 26, 206, 28 locally acquired human cases of West Nile virus (WNV) infection have been confirmed in Île-de-France, including 16 neuroinvasive cases and 4 deaths.

Bronchiolitis 

• The Île-de-France region has entered the pre-epidemic phase for bronchiolitis.

Influenza 

• The number of healthcare visits and the proportion of emergency department activity related to flu-like syndromes have remained stable at a low level (OSCOUR®) over the past few weeks.

COVID-19 

• Emergency department visits: The number of emergency department visits for suspected COVID-19 remained stable compared to the previous week, with 133 visits in week 43 and 144 in week 42. The numbers were comparable to those observed in 2024 and 2025 during the same period and remained well below those observed between 2020 and 2023.
• SARS-CoV-2 in wastewater: The rise in SARS-CoV-2 concentrations in wastewater has slowed.