Infographics. Tiger mosquito: discover the 178 colonized municipalities in Bourgogne-Franche-Comté

As every late spring, the tiger mosquito reappears and continues its spread in Burgundy-Franche-Comté. As of May 22, 2025, 178 municipalities are now colonized by Aedes albopictus. A 45% increase compared to May 2024. But which municipalities are affected?

The tiger mosquito now colonizes 81 of the 96 metropolitan departments. ERV assembly.

Smaller than a 1-cent coin, sporting black and white stripes , the tiger mosquito (Aedes albopictus) has become widely established in France . It now colonizes 81 of the 96 metropolitan departments. In Bourgogne-Franche-Comté, the progression is clearly visible: between May 2024 and May 2025, 55 new municipalities were added to the list of colonized areas.

A municipality is considered colonized if it meets at least one of these three criteria :

Eggs are observed on 3 successive surveys of the same egg-laying trap.
Entomological prospecting allows the observation of larvae and/or adults within a radius greater than 150 meters around a report or a positive trap.
The distance between 2 positive traps or 2 positive reports is greater than 500 m.

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As of May 22, 2025, no fewer than 178 municipalities in the region have been affected by this particularly invasive insect . The highest proportions of affected municipalities are found in Saône-et-Loire and Côte-d'Or. Nièvre, Jura, Doubs, Yonne, Haute-Saône, and the Territoire de Belfort are also found.

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How to protect yourself from the tiger mosquito?

To avoid mosquito bites, it is recommended to close windows, wear light-colored, long, loose clothing , and use skin repellents or mosquito nets at home.

To prevent a proliferation in your garden, it is advisable to remove or empty containers with rainwater . To limit resting places, it is also necessary to clear brush, trim tall grass and hedges, and prune trees. The fan also helps keep mosquitoes away.

Source: Anses, ARS

A vector of diseases such as Zika, dengue fever, and chikungunya , the tiger mosquito represents a growing health risk in many departments. In 2025, Mayotte faced a chikungunya epidemic , while Réunion recorded thousands of cases of dengue fever since the beginning of the year. In mainland France, between May 1 and May 27, 2025, health authorities counted 341 imported cases of chikungunya and 247 cases of dengue fever. A case of Zika was also reported in the Provence-Alpes-Côte d'Azur region.

As part of vector control, the tiger mosquito is monitored more closely between May and November. At the regional level, the ARS, through a mosquito control operator, is deploying a network of egg-laying traps in the most populated urban areas. It is also possible to participate in this monitoring via the tiger mosquito reporting portal .

List of 178 colonized municipalities

Saône-et-Loire (73): Bourbon-Lancy, Branges, Buxy, Chagny, Chaintré, Chalon-sur-Saône, Champforgeuil, Chânes, Charnay-lès-Mâcon, Charolles, Châtenoy-en-Bresse, Châtenoy-le-Royal, Cheilly-lès-Maranges, Clessé, Cluny, Crêches-sur-Saône, Crissey, Cuiseaux, Cuisery, Demigny, Devrouze, Digoin, Dracy-le-Fort, Épervans, Farges-lès-Chalon, Fontaines, Fragnes-La Loyère, Fuissé, Gergy, Givry, Hurigny, L'Abergement-Sainte-Colombe, La Chapelle-de-Bragny, La Chapelle-de-Guinchay, La Roche-Vineuse, La Salle, Lacrost, Laizé, Lans, Le Creusot, Lessard-le-National, Leynes, Louhans, Lux, Mâcon, Marcigny, Marnay, Mercurey, Montceau-les-Mines, Montchanin, Oslon, Ouroux-sur-Saône, Paray-le-Monial, Prissé, Rully, Sagy, Saint-Albain, Saint-Germain-du-Plain, Saint-Marcel, Saint-Rémy, Saint-Symphorien-d'Ancelles, Saint-Vallerin, Saint-Vallier, Sancé, Sassenay, Sennecey-le-Grand, Senozan, Sevrey, Sologny, Tournus, Varennes-le-Grand, Varennes-lès-Mâcon and Virey-le-Grand.

Côte-d'Or (58): Ahuy, Aloxe-Corton, Arc-sur-Tille, Auxonne, Beaune, Bellefond, Belleneuve, Bessey-lès-Cîteaux, Bligny-lès-Beaune, Brazey-en-Plaine, Brochon, Chenôve, Chevigny-Saint-Sauveur, Chorey-les-Beaune, Combertault, Corcelles-les-Arts, Couchey, Dijon, Fénay, Fixin, Flavignerot, Fontaine-lès-Dijon, Genlis, Gevrey-Chambertin, Ladoix-Serrigny, Longchamp, Longecourt-en-Plaine, Longvic, Lux, Magny-sur-Tille, Marsannay-la-Côte, Meursault, Mirebeau-sur-Bèze, Montagny-lès-Beaune, Neuilly-Crimolois, Nuits-Saint-Georges, Ouges, Pagny-le-Château, Perrigny-lès-Dijon, Pommard, Premeaux-Prissey, Quetigny, Ruffey-lès-Beaune, Ruffey-lès-Échirey, Saint-Apollinaire, Saint-Rémy, Sainte-Marie-la-Blanche, Santenay, Savigny-lès-Beaune, Sennecey-lès-Dijon, Seurre, Tailly, Talant, Tart, Til-Châtel, Varanges, Vignoles and Vougeot

Nièvre (16): Cercy-la-Tour, Challuy, Clamecy, Coulanges-lès-Nevers, Decize, Dornecy, Fourchambault, Garchizy, Imphy, La Charité-sur-Loire, La Machine, Marzy, Nevers, Saint-Éloi, Saint-Léger-des-Vignes and Varennes-Vauzelles.

Jura (14): Champvans, Chaussin, Choisey, Crissey, Dole, Foucherans, Le Louverot, Le Vernois, Lons-le-Saunier, Montmorot, Poligny, Saint-Amour, Tavaux and Villette-lès-Dole.

Doubs (8): Arc-et-Senans, Besançon, Chalezeule, Dannemarie-sur-Crète, Devecey, Mandeure, Pontarlier and Thise.

Yonne (4): Auxerre, Fontaines, Givry and Saint-Georges-sur-Baulche .

Haute-Saône (4): Champvans, Marnay, Saint-Marcel and Vesoul.

Territory of Belfort (1): Novillard .