On sunny days, the tiger mosquito is back

More than sixty departments are currently on alert for the tiger mosquito. The list could grow in the coming weeks with the current heatwave.

With the arrival of fine weather and heat, the scourge is likely to get worse. According to a new update this Wednesday of a vigilance map distributed by the Vigilance Moustiques website, 64 departments of metropolitan France, or 67% of the territory, are still on alert for tiger mosquitoes. An alert level that means the insect, easily recognizable by its distinctive spots, is declared, established, and active.

“A heat wave immediately leads to a phenomenon of multiplication and multiplication. We usually say that it takes a tiger mosquito ten days to transform from larva to adult mosquito when it is 23°C during the day and 15°C during the night. But there, if it’s 30 degrees during the day, it’s more than ten days, it’s six/seven days! It’s much faster,” says Stéphane Robert, President of the Mosquito Vigilance site, with Europe1.

The heat wave that is hitting France these days should therefore facilitate its spread.

The vigilance map of the tiger mosquito in metropolitan France
The vigilance map of the tiger mosquito in metropolitan France © Vigilance Moustique

In addition, 28 departments are still on Orange Alert, synonymous with occasional interception of the Aedes-type mosquito, but their situation could change in the coming weeks. “Indeed, we observe that the departments that are in orange vigilance sooner or later switch to red vigilance,” we learn on the same page. 28 departments remain on yellow alert for the time being, which corresponds to an entomological surveillance of the situation.

It should be noted that Mayotte, Réunion, Guyana, Guadeloupe and Martinique have all five been placed in a special category by Vigilance Moustiques as cases of the disease have been reported in these five overseas territories.

Increased alertness

At the beginning of May, the Ministry of Solidarity and Health warned of the increasing presence of the tiger mosquito in France, recalling that it is responsible for many diseases such as Chikungunya, Dengue or again Zika.

If this press release states “not to be bitten by a mosquito” and “to remain vigilant”, especially on the verge of a trip to a red zone, it is also advisable in the case of joint pain, muscle pain, headache, skin rash with or without fever, conjunctivitis, see a doctor as soon as possible.

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