Why mosquitoes hit particularly hard this year

Mosquitoes attack you more than usual? This is normal: the rainy weather then hot has favored their proliferation this year in France.

The mosquito season is well and truly launched: ten French departments are in orange vigilance. But this year more than the others, these insects dreaded for their bites come in numbers.

The Vigilance Mosquito information site received three times more case reports than last year over the same period. "Among them, there are statements of unusual proliferation in several departments"says Stéphane Robert, who is the president.

Rain and heat wave

A phenomenon that is explained by the changing weather in recent months: a rainy spring causing floods and therefore stagnant water conducive to the development of mosquitoes, followed by a heat wave that accelerates the passage to the stadium adult larva and so the proliferation of these insects.

"On average, a larva takes 10 days to become an adult if it is 23 ° C during the day and 15 ° C at night, but this cycle accelerates if it is 30 ° C during the day and 20 ° C at night. You should know that a female mosquito can lay 5 to 15 times in a life of 30 days, with each laying, several dozens of eggs ", says the president of Vigilance mosquitoes.

Favorable weather for tiger mosquitoes

Although there are nearly 70 species of mosquitoes in France, these climatic conditions are particularly favorable to the Aedes family, in other words to tiger mosquitoes, which can be the vector of dangerous diseases.

"Some are known to be more vulnerable than others, and therefore more aggressive stings", says Stéphane Robert. In 2017, Santé Publique France also counted 37 cases of chikungunya, 269 of dengue and 28 cases of Zika virus infection in mainland France.

A drop in temperature to stem the phenomenon

Only the weather could reverse the trend. "There should be a noticeable decrease in temperature, with no rains in. Hot weather is drying up the flooded areas and reducing the chances of female mosquitoes laying eggs that could become adults." Lower temperatures slow down the cycle. maturation of larvae ", concludes Stéphane Robert.

In the meantime, prevention is in order! You should be alert to anything that may contain stagnant water and act as a larval shelter, wear covering clothing, sleep under a mosquito net or use repellents.

Thanks to Stéphane Robert, president of the information website Vigilance mosquitoes.

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Video: Mayo Clinic Minute: Easing the itch of mosquito bites (November 2019).


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