Key Points

Dengue, Chikungunya, and Zika

• Enhanced surveillance for dengue, chikungunya, and Zika began on May 1 and will continue through November 30, the active season for the tiger mosquito (Aedes albopictus) in mainland France

• Resurgence of imported dengue cases in mainland France since 2023, with more than 60% returning from the French West Indies, where an epidemic has been ongoing since mid-2023

• In Île-de-France: 28 confirmed cases of imported dengue investigated in 2024 versus 13 during the same period in 2023

Measles

• Resurgence of measles cases in Île-de-France linked to widespread circulation of the virus in Eastern Europe

Pneumonia

• Decrease in emergency care visits, but levels remain higher than in previous years