It is a viral disease transmitted by an insect vector, in this case…

It is a viral disease transmitted by an insect vector, in this case a mosquito. Reported on October 7 in Biscarrosse, this is the first case of autochthonous arbovirosis: the patient who had not left the territory in the two weeks preceding the symptoms, she was bitten in the region.

Analyzes are underway to find out which virus infected her, among the three possible: dengue fever, Zika or West Nile. The patient is now cured, without treatment and after simple flu-like symptoms, according to the Regional Health Agency (ARS).

This West-Nile fever is endemic in southeastern France, but not yet in New Aquitaine

West Nile at Blaye

At the same time, and without the ARS establishing a link between the two cases, two cases of arbovirosis were also declared on two horses in the Gironde, also bitten by mosquitoes. Normally parked in Cartelègue and Lège-Cap-Ferret, these horses were brought together near Blaye, where they would have contracted the disease via a Culex mosquito.

If the virus is not identified in the case of the woman from Landes, on the other hand, for horses, we know it is West-Nile, according to the Departmental Directorate for the Protection of Populations (DDPP). The latter forwarded the information to rural and equine veterinarians in the Gironde.

No danger to humans

“These are the first cases of contamination with this virus detected to date in our department, writes the DDPP. West-Nile fever is a viral disease transmitted by mosquitoes, which is exclusively infected by infected birds. Equine animals and humans can become afflicted with West-Nile fever when bitten by infected mosquitoes. Infected horses reveal the presence of the virus in an area, but do not transmit the disease and do not pose a danger to humans.”

A prefectural order declaring the two detention sites infested was issued with a ban on movement and mandatory insect control. This West-Nile fever is endemic in southeastern France, but not yet in New Aquitaine.

Importance of mosquito control

According to Fabienne Jouanthoua, head of environmental health policies at ARS, Blaye is on a migration corridor for birds that carry this virus and can transmit it to mosquitoes.