Context
On July 21, 2025, ARS Auvergne-Rhône-Alpes received the report for the suspicion of an Aboriginal dengue case in the town of Belley (Ain).
The samples are being analyzed by the National Reference Center for Arbovirus.
We speak of indigenous cases when a person has contracted the disease without having traveled in the contaminated area within 15 days preceding the appearance of symptoms. Dengue is transmitted from person to person through the bite of a tiger mosquitohimself infected with the virus.
If the case was confirmed, it would be 1is case of Aboriginal dengue in the Ain, and the 3e in the region. The other 2 indigenous cases were reported in Saint-Chamond, in the Loire.
In the Auvergne-Rhône-Alpes region, between 1is May (start of reinforced surveillance) and on July 21, 2025, 97 dengue cas imported were recorded of which 9 in the department of Ain.
Health monitoring and actions implemented
Area concerned
The actions carried out and programmed are only provided for in a restricted area, frequented by the Aboriginal case.
Demonstrate the sector
A demoustication operation, carried out by EIRAD, is scheduled for the night of Thursday 24 to Friday 25 July.
The objective of these treatments is to limit the risk of transmission to other people By eliminating larval lodges and adult mosquitoes, vectors of the virus.
Residents of the sector concerned were informed by a flyer placed in their mailbox. If the inhabitants have not received information in their mailbox, it is because their accommodation is not affected by these treatments.
Check if other people have been contaminated
This demoustication operation will be supplemented by an epidemiological survey, carries it on Tuesday, July 29. It will be led by ARS and Public Health Agents France (SPF), with residents of the district where the person concerned resides.
The objective is to ensure that people living in the sector have not been contaminated by a tiger mosquito bite, to make them aware of the symptoms of dengue and to indicate the driving to be followed in the event of symptoms.
On the other hand, the mayor of the town of Belley, the prefecture of Ain, and health professionals were also informed.
Recommendations to the population
Monitor your health
People returning from travel to tropical zone must be particularly vigilant et :
People living in a sector where tiger mosquitoes are present must also remain attentive and consult a doctor in case of doubt.
Symptoms evocative of chikungunya are, in the absence of other established diagnosis: high fever (> 38.5 ° C), associated with at least another clinical sign such as :
- muscle, joint or lumbar pain, which can last over time,
- rashes,
- headaches,
Protect yourself from mosquito bites
To protect yourself from mosquito bites, it is advisable to use a skin repellent and wear covering and loose clothes.
Limit the proliferation of tigers mosquitoes
The best way to avoid tiger mosquito bites is to prevent them from setting home!
Find all the information on the tiger mosquito in our dedicated section.
