By Thibaut Calatayud
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they multiply in Toulouse and in the surrounding communities. This summer numerous mosquito control operations were carried out in Upper Garonne. The cause ? suspicions of Dengueof chikungunya Y Zika. Cases of autochthonous dengue also verified. A first in Haute-Garonne.
First cases of dengue in Salvetat-Saint-Gilles
At the beginning of September 2022, the municipality of The Salvetat-Saint-Gilles found himself managing the first cases of Dengue indigenous to the history of Haute-Garonne. At least two people have been infected.
Originally a subject who contracted the virus during a trip abroad. Upon his return to Haute-Garonne, he was bitten by a tiger mosquito. The latter was contaminated, then transmitted dengue fever to a resident who had not traveled abroad in recent weeks.
139 cases imported from 1Ahem May
Unfortunately, Haute-Garonne is not the only department where dengue fever appears. On Monday, September 12, in a note addressed to all doctors in Occitania, the General Directorate of Health (DGS) announced that, since July, five episodes of autochthonous transmission of dengue have been identified in the departments of Haute-Garonne, Eastern Pyreneessince high pyreneesbut also Maritime Alps Y Var.
“From May 1 to September 2, 2022, Public Health France counted 139 imported cases of dengue. Since the disease is usually asymptomatic (75%), the total number of imported cases can be estimated at double. From the beginning of the season, 26 autochthonous cases have been detected, corresponding to five transmission episodes, including three major outbreaks in the PACA and Occitanie regions.
Several factors could induce this increased risk in mainland France: “the territorial extension and the high densities of the vector mosquito Aedes albopictus (the tiger mosquito, already established in 67 departments, editor’s note), the resumption of travel and the return of travelers from endemic areas and the current climatic conditions favorable to the multiplication of mosquitoes with heat and rain”, lists the General Directorate of Health.
The DGS expects new cases in the coming weeks
In this context, the DGS considers that the appearance of new cases of dengue in mainland France is “likely” in the coming weeks.
“Its period of activity (that of the tiger mosquito, editor’s note) coincides with summer movements, and the risk of local circulation of the dengue virus appearing from an imported case is maximum from May to November. That is why the tiger mosquito, also a vector of chikungunya and zika, is subject to increased surveillance during this period.
So how to avoid it? “Dengue prevention is based above all on vector control actions, at the individual and collective level. Patients must be absolutely isolated from mosquitoes during their viraemic phase, which lasts about ten days. »
To avoid bites, the General Directorate of Health recommends “wearing clothing that covers and loosens, use skin repellent, place mosquito nets in the openings (doors and windows) and use electric diffusers inside the houses.”
Symptoms of dengue fever
The most common symptoms of dengue fever are fever and the joint pain. There may also be digestive signs and one acne (appearance of red spots). The acute phase lasts about a week and severe forms are rare.
However, “a critical phase may occur between the 4me and 6me day approximately; the warning signs are fever above 39°C after the 5thme day, significant abdominal pain with or without diarrhea, uncontrollable vomiting, restlessness or drowsiness, edema of hemorrhagic signs”, warns the DGS.
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