We know chikungunya or yellow fever. Two of the 150 arboviruses that cause clinical reactions in humans. The vector of these viruses is always the same: arthropods (mosquitoes, midges, ticks …).
Now, certainly, because of climate change, the tiger mosquito is colonizing France. And Auvergne.
Know how to recognize and prevent
This year, with six new departments, a total of 57 of them are where the tiger mosquito is officially “established and active”. Among them, the Puy-de-Dôme.
The tick does not only transmit lyme disease
The Allier and the Haute-Loire join, unfortunately, this year the orange departments (“punctual interception during the last five years”).
As Vigilance Moustiques reminds us, “we observe that the departments which are in orange vigilance sooner or later switch to red vigilance.”
Faced with this threat, citizens are called to contact the Vigilance Moustiques site to prevent the proliferation of tiger mosquitoes (it measures a few millimeters, the black body streaked with white stripes). But also to avoid keeping stagnant water at home.
The mosquito in Cantal
“After a relatively mild winter and a warmer start to spring, the mosquito season has already started a few days ago. This year, we are seeing an earlier, sharper and wider start, with 89 departments already concerned, ie almost the whole territory. “
Nine departments are particularly struck by the early arrival of the mosquito, including Cantal where the arthropods arrived more than a month in advance.
3 factors determining the quantity of mosquitoes.
1. A mild winter, which allows eggs laid before winter to survive until spring.
2. Heavy rain which generate enough stagnant water for the eggs laid to go through their full evolutionary process.
3. Once the rains have fallen, it takes on average 10 days of sufficient heat (23 ° C during the day and 15 ° C at night) to allow mosquito eggs to become larvae then adult mosquitoes. If the temperatures are higher, the cycle is shortened. If they are lower, the cycle lengthens. It takes a sharp and brutal drop in temperatures below 0 ° C for it to stop completely.
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Simon Antony
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