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France - Indigenous cases of dengue fever in mainland France

Pathfinder

Editor, Senior Moderator
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/https://en.wikipedia.org/wiki/Saint-Chamond,_Loire

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Translation Google


Indigenous cases of dengue fever in Saint-Chamond (Loire): update

Health alert
July 21, 2025

vignette%20veille%20sanitaire_cas%20autochtone.png.jpg


Following the first case of indigenous dengue fever reported on July 4, the ARS Auvergne-Rhône-Alpes received a report of a second indigenous case on July 15, also in Saint-Chamond. Find all the information on this situation and the actions implemented by the ARS, Public Health France, and EIRAD.

Background on the second case of indigenous dengue fever in Saint-Chamond

On July 15, 2025, the ARS received a report of a second case of indigenous dengue fever . This is the second indigenous case of dengue fever identified this year in Saint-Chamond, in the Loire and Auvergne-Rhône-Alpes regions.

At this stage, it is not possible to establish a link with the first indigenous case identified in Saint-Chamond . Investigations are still ongoing.

Most of the time, dengue cases reported in mainland France involve people who were infected during a stay in a tropical region. If people return infected, these are considered imported cases.

The tiger mosquito present in our territory can become infected by biting a person who has been infected in a tropical zone and, by biting them, contaminate a person who has not traveled. This is then a native case.

Dengue symptoms occur on average within 4 to 7 days after the infective bite.

Health monitoring and actions implemented

The ARS and its partners are working to prevent tiger mosquitoes in the neighborhood from transmitting the disease to other people: several actions are being carried out within a well-defined perimeter. Clear mosquitoes from the area

An entomological survey was carried out on July 18, 2025: it confirmed the presence of tiger mosquitoes in the areas frequented by the infected person and informed residents of an adulticide treatment.

A mosquito control operation will take place during the night of Monday, July 21st to Tuesday, July 22nd to limit the risk of transmission. Residents in the affected areas have been informed by a flyer placed in their mailboxes. Around one hundred homes are affected.

These actions are carried out by EIRAD , an operator mandated by the ARS in the fight against vectors.

For more information on mosquito control operations (schedule, sector, etc.), consult our dedicated page .


Check if other people have been infected

A door-to-door epidemiological survey will be carried out on July 22 by agents of the ARS and Public Health France among residents of the place frequented by the infected person.

The aim is to ensure that people living in the area have not been infected by a tiger mosquito bite, to raise awareness of the symptoms of dengue fever and to advise them on what to do if they experience symptoms.

Furthermore, the Gier-Saint-Chamond Hospital Center and healthcare professionals (doctors, pharmacists, and medical analysis laboratories, members of the Territorial Professional Health Community) in the Saint-Chamond area have been informed of the situation.
As a reminder, dengue fever is a notifiable disease : healthcare professionals must report any diagnosis of dengue fever to the Regional Health Agency (ARS).


Context and actions implemented for the first case of indigenous dengue fever in Saint-Chamond
Recommendations to the population

Monitor your health

People returning from travel to tropical areas should be particularly vigilant and:
  1. avoid being bitten by tiger mosquitoes when they return
  2. Consult a doctor immediately if symptoms appear.
People living in an area where tiger mosquitoes are present should also remain vigilant and consult a doctor if in doubt.

Symptoms suggestive of dengue fever are, in the absence of another established diagnosis: the sudden onset of a high fever (>38.5°C), associated with at least one other clinical sign such as:
  1. headaches,
  2. muscle, joint or lower back pain,
  3. skin rashes,
  4. in the absence of other infectious signs: respiratory signs, infected wounds, etc.
Limiting the proliferation of tiger mosquitoes

The best way to avoid tiger mosquito bites is to prevent them from taking up residence in your home!
Find all the information on the tiger mosquito in our dedicated section.
In the Auvergne-Rhône-Alpes region, between May 1 [SUP]( [/SUP] start of enhanced surveillance) and July 15, 2025, 92 cases of imported dengue fever were recorded, including 8 in the Loire.





https://www.auvergne-rhone-alpes.ar...dengue-saint-chamond-loire-point-de-situation


 
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/https://en.wikipedia.org/wiki/Belley
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Strong suspicion of an indigenous case of dengue in Belley (Ain): situation update

Health alert
July 24, 2025


vignette%20veille%20sanitaire_cas%20autochtone.png.jpg


On July 21, 2025, the ARS Auvergne-Rhône-Alpes received a report of a highly suspected case of indigenous dengue fever in Belley (Ain). Find all the information on this situation and the actions implemented by the ARS, Public Health France, and EIRAD.

Context

On July 21, 2025, the ARS Auvergne-Rhône-Alpes received a report of a suspected case of indigenous dengue fever in the commune of Belley (Ain).

The samples are currently being analyzed by the National Reference Center for Arboviruses .

A native case is defined as a person who has contracted the disease without having traveled to a contaminated area within 15 days prior to the onset of symptoms. Dengue fever is transmitted from person to person through the bite of a tiger mosquito , which is itself infected with the virus.

If confirmed, this would be the first [SUP]case[/SUP] of indigenous dengue fever in Ain, and the third [SUP]in[/SUP] the region. The other two indigenous cases were reported in Saint-Chamond, in the Loire .

In the Auvergne-Rhône-Alpes region, between May 1 [SUP]([/SUP] start of enhanced surveillance) and July 21, 2025, 97 cases of imported dengue fever were recorded, including 9 in the Ain department.


...
https://www.auvergne-rhone-alpes.ar...htone-de-dengue-belley-ain-point-de-situation
 
Translation Google

Indigenous case of dengue in Belley (Ain): update

Health alert
July 28, 2025


vignette%20veille%20sanitaire_cas%20autochtone.png.jpg


On July 21, 2025, the ARS Auvergne-Rhône-Alpes received a report of a highly suspected case of indigenous dengue fever in Belley (Ain). The case was confirmed on July 28. Find all the information on this situation and the actions implemented by the ARS, Public Health France, and EIRAD.

Context

On July 21, 2025, the ARS Auvergne-Rhône-Alpes received a report of a suspected case of indigenous dengue fever in the commune of Belley (Ain).

On July 28, the National Reference Center for Arboviruses confirmed that the case was positive for dengue fever.

A native case is when a person has contracted the disease without having traveled to a contaminated area in the 15 days preceding the onset of symptoms. Dengue fever is transmitted from person to person through the bite of a tiger mosquito , itself infected with the virus.

This is the first [SUP]case[/SUP] of indigenous dengue fever in Ain, and the third [SUP]in[/SUP] the region. The other two indigenous cases were reported in Saint-Chamond, in the Loire .

In the Auvergne-Rhône-Alpes region, between May 1 [SUP]([/SUP] start of enhanced surveillance) and July 21, 2025, 97 cases of imported dengue fever were recorded, including 9 in the Ain department.


...
https://www.auvergne-rhone-alpes.ars.sante.fr/cas-autochtone-de-dengue-belley-ain-point-de-situation



 
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