Mainland France Reports More Chikungunya, Dengue, Zika Cases in 2025

According to recent data published by France Public Health, international travelers are returning to mainland France infected with various mosquito-transmitted diseases.

As of June 18, 2025, France reported that over the past six weeks, the following diseases have been identified:

Chikungunya: 583 imported cases of chikungunya. Additionally, two unrelated indigenous (local) cases of chikungunya have been identified in 2025, one in the Var department and the other in the Hérault department. This report does not include data from the ongoing chikungunya outbreaks in the French Departments in the Indian Ocean.

Dengue: 395 imported cases of dengue fever,

Zika: 2 imported cases of Zika.

The chikungunya, dengue, and Zika viruses are primarily transmitted by Aedes mosquitoes, specifically Aedes albopictus (tiger mosquito), in mainland France. Aedes albopictus has been established in southern France since 2004 and has been gradually spreading since then.

At the start of 2025, 81 out of 96 departments were colonized by the vector mosquito Aedes albopictus.

While dengue and Zika vaccines are not yet available as of June 23, 2025, two chikungunya vaccines are commercially offered in various countries, including the United States.