Key Points

Chikungunya, Dengue, and Zika

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

• 127 imported cases of dengue
• 35 imported cases and 9 locally acquired cases of chikungunya
• 2 imported cases of Zika

West Nile virus infections

• As of November 2, 2026, 30 locally acquired human cases of West Nile virus infection have been confirmed in Île-de-France, including 16 cases of neuroinvasive disease and 4 deaths.

Bronchiolitis 

• The Île-de-France region remains in 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 decreased compared to the previous week, with 111 visits in Week 44 and 133 in Week 43. This decline was particularly evident among children under 15 and adults aged 65 and older. The numbers remained comparable to those observed in 2024 and 2025 during the same period.