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An indigenous case of dengue was confirmed in the town of Belley in Ain. This announcement was made public by the ARS (Regional Health Agency) Auvergne-Rhône-Alpes which received the report on July 21, 2025, after the confirmation this Monday, July 28, 2025 of the CNR (National Reference Center) arbovirus that The case was positive for dengue After analyzes confirming suspicion.
Dengue in the Ain: a case contracted locally
The case concerns A person living in Belley who had not traveled in tropical zone within 15 days preceding the appearance of symptoms. The infection was therefore Locally contracted via the bite of a tiger mosquito infected. Dengue in this context is said nativewhich means a transmission to the territory without imported origin.
The regional context: already two cases elsewhere
Before this confirmation, two indigenous cases had already been reported in the Loirein Saint -Chamond, in July 2025. In Ain, it is the 1st case of Aboriginal dengue, and the 3rd in the region.
In addition, between May 1 and July 21, 2025, the region recorded 97 imported dengue casesdont 9 In the department of Ain.
Current public health measures
A targeted demoustication operation was carried out by EIRAD on the night of July 24 to 25 in the Bas -Bugey district, in order to eliminate vectors and larval cottages.
An epidemiological survey was also launched by the health authorities (ARS and Public Health France) via door-to-door on July 29, in order to:
- Check if other residents of the neighborhood have symptoms,
- inform the local population about the signs of dengue,
- Specify the driving to follow in the event of aers Ars Auvergne-Rhône-Alpes
- The residents concerned were informed individually via flyers deposited in their mailbox.
The progressive implementation of the tiger mosquito now promotes The emergence of Aboriginal transmissions from dengue, imposing increased vigilance of health authorities and the local population.
For any questions or reports, Contact ARS Auvergne – Rhône – Alpes Or consult the France Public Health Site.
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