Key Points 

COVID-19

• SARS-CoV-2 in wastewater: The level of SARS-CoV-2 circulation in wastewater followed an overall trend toward stabilization in S23. The intensity of viral circulation remained low.
• The number of SOS Médecins calls and emergency department visits for suspected COVID-19 remained stable at low levels for several weeks.

Mpox

• The weekly number of smallpox B cases in Île-de-France increased during April, followed by a decrease in May according to data available at this stage. The levels recorded in 2026 showed a trend similar to that observed during the same period in 2025, while remaining well below those reported in 2022.

Chikungunya, dengue, and Zika

• Imported cases: 44 of dengue, 6 of chikungunya