26 cases of autochthonous dengue fever in France this year, a record figure that worries the authorities

There have been 26 cases of autochthonous dengue this year in France. A record figure that worries the health authorities. For the first time, the Pyrénées-Orientales are concerned.

It’s a record that we would have done without. The Ministry of Health has just communicated the figures for dengue fever, this disease transmitted by the tiger mosquito which is now present in 67 departments. In 2018, it was listed in 58 departments.

There are 26 cases of autochthonous dengue as of September 13. What particularly worries the authorities is that these are cases of autochthonous dengue, that is to say affecting people who have not traveled abroad. They were only about ten a year before.

In Paca and Occitania

Since July 2022, 5 episodes of autochthonous dengue transmission have been identified in the Paca and Occitanie regions. The occurrence of episodes in departments hitherto spared, such as the Eastern Pyrenees (66), Haute-Garonne (31) and Hautes-Pyrénées (65), as well as their size (clustered cases in Alpes-Maritimes (06) and Var (83)), testify to an increase in risk of dengue fever in mainland France, but also of chikungunya and zika, also transmitted by the Aedes albopictus mosquito (tiger mosquito).

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Several factors come into play: the extension over the territory and the high densities of the mosquito vector Aedes albopictus; 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. “Other cases or outbreaks are likely in the coming weeks in metropolitan France”announces the urgent sheet issued by the ministry.

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In France, 9 cases of dengue fever and three of zika were transmitted to humans by the tiger mosquito in 2019

From May 1 to September 2, 2022, Public Health France counted 139 imported cases of dengue fever. As the disease is often asymptomatic (75%), the total number of imported cases can be estimated at double.

Reporting of dengue fever is mandatory on the part of health professionals, and must be carried out as soon as possible to allow the ARS to implement investigations and vector control measures in places frequented by patients.

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