The virus circulates without traveling: dengue detected locally in Saint-Chamond
This is a first this year in Auvergne-Rhône-Alpes: a case of dengue transmitted locally was identified in Saint-Chamond, in the Loire. The patient has not traveled in the previous 15 days the appearance of symptoms, which means that the infection is autochonethat is to say transmitted by a Locally infected tiger mosquito.
According to the National surveillance bulletin published on July 9, this case constitutes the The only Aboriginal dengue episode recorded in France hexagonal in 2025against nine households from Chikungunya. The start date of the signs dates back to July 1.
Dengue is a viral disease transmitted by the bite of a mosquito of the genre Aedes. Symptoms include fever, muscle pain, rashes, and sometimes severe forms.
Demonstication, door-to-door and increased surveillance: the local response is organized
Upon confirmation of the diagnosis, the ARS launched a Entomological and epidemiological survey In the district concerned in Saint-Chamond. Teams lead door-to-door operations To inform the population and detect possible other cases.
Two Insecticide treatments were applied within a perimeter of 150 to 300 meters around the patient’s home, targeting adult mosquitoes and larval lodges.
“These operations are carried out to reduce the risk of virus transmission to other people”recalls Ars Auvergne-Rhône-Alpes.
A summer under surveillance: tropical mosquitoes gain ground
With more than 550 cases imported from dengue Between May 1 and July 8 in France, the risks of local transmission are very real. The tiger mosquito is located in 81 departments, active from May to November.
If indigenous cases remain isolated, their rehearsal each year shows that the phenomenon is trivialized. Public health France Note:
“The number of transmission foci illustrates the significant risk of indigenous transmission of these viruses in France”.
How to protect yourself: the right reflexes to adopt without delay
- Remove any stagnant water (saucers, gutters, tarpaulins …);
- Install mosquito nets and use suitable repellents;
- Wear long clothes during bite (morning and evening);
- Monitor symptoms After bite or trip to risk zone;
- Inform his doctor From the first signs for reporting.
The evolution of the situation will largely depend on the level of collective mobilization Faced with the tiger mosquito this summer.