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Tiger Mosquito Eggs Found in Rennes: Two Neighborhoods on Alert

Tiger Mosquito Eggs Found in Rennes: Two Neighborhoods on Alert

October 11, 2025 Dr. Jennifer Chen Health

Tiger Mosquito in‍ France: Autumn Update

  • What: The⁢ Asian tiger mosquito (aedes albopictus) remains active in France later than usual, with eggs‌ found‍ even in October.
  • Where: ​Primarily reported in the Brittany region ​(Rennes ‍specifically), but the species is established in numerous departments across France.
  • When: Typically active ‌from May to‌ November, but 2023 shows continued activity into late October/possibly November. Eggs have been found in⁤ Rennes in October 2023.
  • Why it Matters: ⁤ The tiger mosquito is an ⁣invasive species and a ⁢vector for ​diseases⁢ like dengue ⁢fever, chikungunya, and zika virus. Prolonged activity ⁢increases the risk ‌of transmission,even if ​cases are currently ‌rare in⁣ France.
  • What’s Next: Continued monitoring for mosquito presence and ⁣egg-laying. Public health authorities are urging vigilance and preventative ​measures (removing standing water). The length ⁤of the season will depend on weather conditions.

Geographic Distribution (Departments with Established Populations – 2023)

Region Departments⁤ (Examples)
Auvergne-Rhône-Alpes Ain, Ardèche, Drôme, Isère, Loire,‍ Rhône
Occitanie Aude, ‌Gard, Hérault, Pyrénées-Orientales
Provence-Alpes-Côte d’Azur Alpes-Maritimes, Bouches-du-Rhône, Var
Nouvelle-Aquitaine Charente-Maritime, Gironde, ‍Landes
Brittany Ille-et-Vilaine (Rennes)
Other Numerous others – see Vigilance​ Moustiques map for a complete list.

– drjenniferchen

The continued presence of the⁢ tiger mosquito ​into late autumn is concerning.Warmer temperatures and increased rainfall contribute to its ‌extended breeding season. While France hasn’t experienced widespread outbreaks of ​mosquito-borne diseases, the risk is present, and vigilance is⁢ crucial. The focus on eliminating breeding sites – even small ​amounts of standing water – remains ​the ‍most effective preventative measure. The‌ reports from Rennes highlight that the‌ mosquito is expanding its range, even within brittany, which was previously considered⁢ less ​affected.

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