Indigenous dengue cases reported: three confirmed cases

Usually absent from mainland France, dengue fever is an infectious disease that must be declared. Each reported case, whether imported or indigenous, gives rise to a health investigation carried out by teams from ARS Occitanie and Public Health France to guide and adapt the prevention and control operations to be put in place at the same time. with the patients concerned and in their immediate environment.

After an initial detection of two autochthonous cases of dengue fever in the Hautes-Pyrénées department in Andrest, a third case, prior to the first two, was declared and confirmed in the same district. The state of health of the people does not cause any particular concern

Several mosquito control operations have already been carried out in the town of Andrest, the last of which took place on the night of September 1 to 2. These operations aim to destroy all mosquitoes and breeding sites located near the places where the people concerned live, to prevent tiger mosquitoes (Aedes albopictus) from becoming carriers of this virus and vectors of new contaminations, after having bitten one infected people.

New mosquito control operations are planned in the department in the coming days. Residents will be notified by information placed in their mailboxes prior to each operation.

In active consultation with local elected officials and the health professionals concerned, all the awareness-raising actions deployed since the start of this campaign have given rise to several other reports which are still currently undergoing additional health investigations.

All the inhabitants of this sector who would present clinical signs suggestive of a dengue fever infection, are called upon to consult their attending physician as soon as possible.
The suggestive symptoms are, in the absence of another established diagnosis:
• a high fever (>38.5°C) of sudden onset;
• associated with at least one other clinical sign such as headaches, muscle, joint or lumbar pain;
• in the absence of cough, runny nose, sore throat, breathing difficulties or infected wounds.
Additional information is available on the course of interventions and treatments on the ARS Occitanie website.
To learn more about dengue fever and protect yourself from tiger mosquitoes:

  1. Dengue is a generally mild disease whose symptoms, similar to those of the flu (high fever, joint pain, severe headaches), can be temporarily disabling. This disease is transmitted from person to person through the bite of a tiger mosquito (Aedes albopictus) previously infected with the virus.
  2. A case is said to be “autochthonous” when a person contracts the disease without having traveled to the contaminated zone in the 15 days preceding the onset of symptoms.
    How can the tiger mosquito become a “vector” of disease?
  3. Practical advice to limit the proliferation of mosquitoes at home!
    The mosquito that often bites you does not fly more than 150m from its place of appearance.

Good reflexes are therefore gestures of proximity:

Eliminate places where water can stagnate: small rubbish, bulky items, green waste… Used tires can be filled with earth, if you don’t want to throw them away.

Change the water for plants and flowers once a week or, if possible, remove or fill the saucers of flowerpots with sand, replace the water in vases with wet sand.

Check the proper flow of rainwater and waste water and clean regularly: gutters, manholes, gutters and drains.

Cover water tanks (water cans, cisterns, basins) with a mosquito net or a simple cloth.

Cover small pools that are out of use and drain the water from the covers or treat the water (bleach, chlorine tablets, etc.).

Eliminate adult mosquito resting places: clear brush and trim tall grass and hedges, prune trees, pick up fallen fruit and plant debris, reduce sources of moisture (limit watering), maintain your garden.
A person traveling to a country where dengue, chikungunya or Zika are present develops one of these diseases by being bitten by a mosquito carrying one of these viruses, then returns to their country of residence.

This is called an imported case.

Back in metropolitan France in an area where the tiger mosquito is present, this sick person is bitten by a healthy tiger mosquito which is then infected with one of these viruses. After an internal multiplication cycle, this mosquito can, after a few days, transmit the virus to another healthy person by biting it.
This is called an aboriginal case

  1. Practical advice to limit the risk of mosquito bites:
  • Use indoor insecticide dispensers and outdoor coils, insect repellents…
  • Use individual repellents.
  • Install mosquito nets.
  • Wear loose, covering clothing.
  • Keep rooms cool (air conditioning).
  • Set attractive traps.
  • Use fans to keep mosquitoes away.

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