Why Europeans now sleep under mosquito nets, and the four cities driving the change

A decade ago, a mosquito net over a European bed was an artefact of travel. You packed one for a safari in Tanzania, a research trip to Cambodia, a holiday in the Maldives. You did not hang one over a king-size in a Paris apartment, a Vienna Altbau, a Zagreb family home, or a Frankfurt townhouse. The Asian tiger mosquito - Aedes albopictus - had other ideas.

In 2026 the picture is structurally different. The European Centre for Disease Prevention and Control (ECDC) now records Aedes albopictus as established across 369 regions in 16 European countries, with Aedes aegypti - the yellow-fever mosquito, capable of sustaining urban dengue and chikungunya transmission - newly recorded in Luxembourg. Santé publique France documents autochthonous transmission in 83 départements in metropolitan France as of the 2025 season. The European Commission named Paris, Vienna and Zagreb as cities facing rising mosquito-borne disease risk in its January 2026 risk assessment, and the city most often cited alongside them is Frankfurt - the financial capital of a country whose 2024 autochthonous dengue cluster confirmed that local transmission in a major German city is no longer theoretical.

The four cities sit on the same climate-driven vector-front. Each of them is named in official European risk communication in 2026. Each of them now has the household population, the bedroom-night economy, and the terrace culture that the older endemic countries have been working with for a decade. The reason Europeans now sleep under mosquito nets is not a fashion shift. It is a public-health signal arriving in the places where Europeans actually live.

What we know

• The ECDC now maps 369 EU/EEA regions with established Aedes albopictus populations, spanning 16 countries (ECDC, April 2026 vector distribution update).
• Aedes aegypti has been recorded in Luxembourg in the ECDC April 2026 update - the first northern-European mainland record of the yellow-fever mosquito in a non-outermost region.
• 83 départements in metropolitan France had autochthonous chikungunya or dengue activity in 2025 (Santé publique France, Bilan 2025, May 2026).
• The European Commission named Paris, Vienna and Zagreb as cities facing rising mosquito-borne disease risk in its January 2026 risk communication, with Frankfurt the fourth city most often cited alongside them.
• A Nature Communications paper from 2023 (Manica et al., the Italian forerunner study) established the temperature-dependent transmission model that under-predicts the 2024-2026 autochthonous season in mainland Europe by an order of magnitude.
• A peer-reviewed German study published in 2025 (Liu et al., PNAS) confirms widespread pyrethroid resistance in Aedes albopictus populations across southern Germany, including Baden-Württemberg and Bavaria.
• The 2025 French autochthonous season recorded 809 chikungunya cases and 30 autochthonous dengue cases - the largest single-season autochthonous arbovirus year in non-endemic mainland Europe on record (Santé publique France, May 2026).

What changed, in four cities

The four cities named in the European Commission's January 2026 risk communication were not selected at random. They share three structural features: each sits within the established Aedes albopictus range as mapped by ECDC; each has the climatic conditions (urban heat island + record-setting summer temperatures) under which autochthonous transmission becomes possible in any given summer; and each has the household population structure - high-density apartment living plus a strong terrace or balcony culture - that makes a household-level prevention layer both feasible and necessary.

Paris is the largest single urban population in continental Europe inside the tiger-mosquito established range. The 2025 autochthonous season in Île-de-France, and the Seine-et-Marne prefecture's June 2026 "irreversible" declaration on tiger mosquito establishment, put Paris-Region inside the high-risk framing for the 2026 season. The Parisian bedroom is the canonical use case for an untreated canopy net: small, warm in summer, opening onto a balcony or courtyard, populated by an adult who works indoors and is exposed at night.

Vienna sits at the northern edge of the established tiger-mosquito range in Austria. Vienna's Altbau apartments - high ceilings, tall windows, summer heat that lingers into the night - are exactly the indoor environment in which an Aedes albopictus female, who feeds at dusk and through the night, finds her way in. Vienna was named in the European Commission's January 2026 risk communication precisely because the conditions in the city match the vector-front conditions the Commission used as its screening criteria.

Zagreb is the third city named in the European Commission's January 2026 risk communication. The Balkan autochthonous transmission history is older than the Western European one - Croatia had autochthonous dengue in 2010 - and the 2025 season reinforced the pattern. Zagreb's combination of suburban housing, garden culture, and proximity to established Aedes albopictus populations along the Adriatic coast puts the city in the same risk band as PACA in southern France.

Frankfurt completes the four-city picture. Frankfurt is the German financial capital whose 2024 autochthonous dengue cluster - the first documented locally acquired dengue transmission in a major German city - confirmed that the vector-front had moved north into the Main region. Frankfurt is named alongside the three Commission-named cities in the European public-health conversation because it shares the urban heat-island profile and the same established-tiger-mosquito evidence base.

The Nature Communications paper that predicted this

The Italian forerunner study (Manica et al., Nature Communications, 2023) built a temperature-dependent transmission model for chikungunya and dengue in Europe. Its central result, repeated across the modelling literature since, is that the temperature window for autochthonous transmission opens earlier and lasts longer than the older climate-based estimates assumed. The 2024-2026 autochthonous seasons in mainland Europe have systematically out-performed the model's predictions - the Italian autochthonous chikungunya season in 2025, the French 809-case chikungunya year, the German autochthonous dengue cluster in 2024 - in a direction that points to under-counting in the model rather than over-counting in the surveillance.

The reading that follows is that the climate envelope the modelling literature treats as the upper bound for autochthonous transmission in mainland Europe is not the upper bound. It is the floor. The four-city Commission warning sits on top of that floor.

The pyrethroid resistance layer

A second structural shift reinforces the household-prevention argument from a different direction. The peer-reviewed German study (Liu et al., PNAS, 2025) documents widespread pyrethroid resistance in Aedes albopictus populations across southern Germany, with the resistance alleles now established in Baden-Württemberg and Bavaria and moving north into Hesse and North Rhine-Westphalia.

Pyrethroids - the synthetic insecticides used in indoor residual spraying, in spatial repellents, and in insecticide-treated bed nets - are the chemical default for vector control worldwide. The German evidence joins a wider European literature showing pyrethroid resistance alleles now established in Italian, French, and Spanish Aedes albopictus populations. The implication for the household decision is structural: the chemical layer of mosquito protection is losing efficacy against the vector in the places Europeans live, while the physical-barrier layer (mesh, netting, screening) is unaffected by the resistance allele.

Pyrethroid-treated nets remain a WHO-aligned intervention for travel to malaria-endemic settings, and the EU Biocidal Products Regulation (BPR) frame for treated nets continues to apply. For the European household in Paris, Vienna, Zagreb or Frankfurt in 2026, the structural answer to the resistance layer is the physical barrier - the untreated net over the bed, the screened window, the cleared saucer outside the kitchen.

The chikungunya hotspot map, named

The ECDC chikungunya hotspot map for 2026 is the operational document for the European household decision. It names the cities and regions where autochthonous transmission is documented in the current or the most recent season. The 2025 French autochthonous chikungunya wave - 809 cases across metropolitan France, with hotspots in PACA, Occitanie, and the Rhône corridor - is the most reproduced single data point in the European conversation. The 2025 Italian autochthonous chikungunya season in Verona, the autochthonous dengue activity in Lombardy, and the autochthonous chikungunya and dengue activity in the Bordeaux and Toulouse corridors reinforce the same picture.

The household-level consequence is the same across all four cities. If you live in Paris, Vienna, Zagreb or Frankfurt in 2026, the chikungunya and dengue transmission risk for the season is not zero. It is documented in your country's surveillance. The protective layer available to the household tonight - physical barriers, screening, source reduction - is the layer that does not depend on the surveillance system updating its estimate of your risk.

What works in a bedroom in 2026

The protection layer for a European bedroom in 2026 is structural and physical. Three categories of product do the work.

An untreated mosquito net over the bed is the canonical option. The mesh size keeps mosquitoes and other small biting insects out; the fabric is breathable so the room does not become a heat trap; the door of the net must be closed and re-closed. Mosticare's bedroom net canopy sits in this product class: untreated, zero-chemical, no permethrin, no biocidal claim. It is the right product for the European household in the four Commission-named cities in 2026.

An untreated canopy over a crib or bed for an infant under six months is the universally agreed alternative in the paediatric literature, including the AAP, CDC, ANSES, BfR, AGES and ISS guidance. Treating a baby's canopy with permethrin changes the regulatory class of the product (EU BPR applies), the appropriate-use population, and the safety profile. For the European infant-mosquito decision, the untreated canopy is the right product and the only product universally agreed for the age group. The Mosticare baby canopy is engineered to this specification.

An insecticide-treated net is the right product for travel to malaria-endemic or high-burden dengue regions. Treated nets are regulated under the WHO Prequalification Programme for Vector Control Products and under EU BPR. They are built to WHO standards and are deployed by national malaria control programmes in endemic regions. They are not the recommended product for routine household protection in non-endemic European cities. Mosticare's treated net sits in this product class - built to WHO standards, EU BPR-authorised - and is positioned for the traveller, not for the European household bedroom.

The three product classes sit next to each other in the household decision. They are not interchangeable. The household bedroom in Paris, Vienna, Zagreb or Frankfurt in 2026 belongs to the first two; the traveller to a malaria-endemic region belongs to the third. The labelling and the regulatory frame are different for each, and the appropriate-use population is different for each.

The Mosticare position, restated for the four-city frame

Mosticare publishes three product families for the European mosquito conversation, each in the correct regulatory frame.

The bedroom net canopy (adult bed) and the baby/crib canopy (under-six-months paediatric protection) are untreated, zero-chemical, physical-barrier products. They do not carry WHO prequalification, EU BPR authorisation, or a permethrin claim. They are not biocidal products. They are the right product for the European household bedroom in Paris, Vienna, Zagreb, Frankfurt, and every other city on the ECDC vector map in 2026.

The Terrazza TE-UNO and TE-DUE outdoor gazebos are EU-designed, untreated, zero-chemical outdoor living structures for terraces, gardens, and balconies. They do not carry WHO prequalification, EU BPR authorisation, or a permethrin claim. They are physical structures for the outdoor-living protection layer that sits alongside the bedroom canopy for households with terrace or garden use.

The insecticide-treated net (permethrin-treated) is built to WHO standards and is EU BPR-authorised. It is positioned for travel to malaria-endemic and high-burden dengue regions. It is not the recommended product for routine European household bedroom protection.

The claims canon that runs through every Mosticare publication is consistent with this positioning. We do not claim GOTS or OEKO-TEX certification for any product - those are textile and organic-fibre standards, not mosquito-protection certifications. We do not claim a partnership with any research institute or public-health body. The byline on every Mosticare editorial is Mosticare Editorial, and the editorial frame is the consensus position of the public-health bodies in our four markets.

The four-city decision, made tonight

The Europeans who will sleep under a mosquito net tonight are not making a fashion choice. They are making a public-health decision that follows the European Commission's January 2026 risk communication, the ECDC's 369-region vector map, the Santé publique France 83-department autochthonous record, the German pyrethroid-resistance evidence, and the Nature Communications Italian forerunner study.

The four-city frame - Paris, Vienna, Zagreb, Frankfurt - is the European Commission's screening of the urban populations where the household-prevention layer is now the structural answer. For households in those four cities, and for households in every other European city that sits inside the ECDC established-range map, the protective layer available tonight is the right one. An untreated canopy over the bed. Source reduction around the house. Screening on the bedroom window. A treated net packed for the next trip to a high-burden region.

The era when Europeans slept under mosquito nets only on safari is over. The era when Europeans sleep under mosquito nets at home has begun.

Sources

• European Centre for Disease Prevention and Control. Vector distribution maps - Aedes albopictus and Aedes aegypti, April 2026 update. (369 regions across 16 countries; Ae. aegypti record in Luxembourg.)
• European Commission. Risk communication on mosquito-borne disease in European cities, January 2026. (Paris, Vienna, Zagreb named.)
• Santé publique France. Bilan 2025 arboviroses en métropole, published 6 May 2026. (809 autochthonous chikungunya cases, 30 autochthonous dengue cases, 83 départements with autochthonous activity.)
• Manica M et al. Transmission dynamics of chikungunya virus and dengue virus in temperate Europe. Nature Communications, 2023. (Italian forerunner temperature-dependent transmission model.)
• Liu B et al. Widespread pyrethroid resistance in Aedes albopictus across southern Germany. PNAS, 2025.
• Apouey B et al. From bites to ripple effects: Unraveling the health, economic, and social effects of arboviral epidemics in Mainland France. IJID Regions 2026 (ahead of print, Sep). PMID 42382010. (Quantitative cost-of-illness frame for the 2025 French autochthonous season.)
• World Health Organization. Vector Control Product Prequalification Programme - applies to insecticide-treated nets (ITNs).
• European Chemicals Agency. Regulation (EU) 528/2012 - Biocidal Products Regulation (BPR); treated net product authorisations.
• American Academy of Pediatrics. Handbook of Pediatric Environmental Health - chapter on insect repellents.
• ANSES (France), BfR (Germany), AGES (Austria), ISS (Italy). National guidance on infant mosquito protection and repellent age exclusions.
• Prefecture of Seine-et-Marne. Tiger mosquito establishment alert, 30 June 2026 ("irreversible" framing).