West Nile virus in Greece 2026: what households in the affected regions need to know

Greece is a first-time 2026 entry on the ECDC West Nile virus weekly platform, with one affected area recorded as of 8 July 2026 in the ECDC week-28 weekly. The country has had locally acquired human cases every year since the 2010 outbreak in Central Macedonia, and the 2018 outbreak centred on the Athens metropolitan area was the largest ever recorded in Greece, with more than 300 locally acquired cases and over 50 deaths. The 2018 outbreak is a clear reminder that urban and peri-urban WNV transmission is possible in Greek conditions, not just rural, and the Hellenic National Public Health Organization (EODY) publishes weekly bulletins from late June through October each season.

This landing is written for Greek households in the affected regions and for travellers, seasonal workers, and second-home owners in rural and peri-urban areas during the transmission season. It covers the 2026 surveillance signal, the historical Greek geography of WNV transmission, the clinical picture, the household protection layer, and the EODY reporting infrastructure that a Greek household should know about.

The 2026 Greek season so far

The 2026 Greek WNV season opened with Greece's first appearance on the ECDC week-28 weekly, dated 8 July 2026, with one affected area reported. The affected area sits within the recurrent Central Macedonia regional units, consistent with the historical Greek pattern. ECDC framed the 2026 trajectory plainly: "seasonal weather conditions are currently favourable for mosquito-borne transmission," so "more cases are expected to occur in the coming weeks" [ECDC WNV weekly, week 28; ECDC CDTR, week 28].

The week-28 Greek entry is the first 2026 confirmation of what EODY had been flagging through the early-season arbovirus surveillance. EODY runs a weekly integrated surveillance bulletin from late June through October each year, with case counts, affected regional units, and a comparison against the running five-year median. The 2025 Greek season finished at low case counts relative to the 2018 and 2010 outbreaks, but every year since 2010 has recorded at least one locally acquired case somewhere in the country, and the structural pattern is that the central and northern regional units are the recurrently affected zone.

For a Greek household, the 2026 signal is the first formal weekly confirmation of the autochthonous-transmission window for this season. The structural pattern is the same as in prior years; the per-week numbers will move with the weather and the bird-reservoir activity.

The historical Greek geography of WNV transmission

Greece had its first major WNV outbreak in 2010 in Central Macedonia. The 2010 outbreak was the country's introduction to the autochthonous WNV transmission cycle, and the recurrently affected regional units since then have been Central Macedonia (especially the regional units of Thessaloniki, Pella, Imathia, Kilkis, and Serres), East Macedonia and Thrace, and Western Greece. The 2018 outbreak centred on the Athens metropolitan area was the largest ever recorded in Greece and demonstrated that urban and peri-urban WNV transmission is possible in Greek conditions, not just rural. The 2018 outbreak killed more than 50 people, predominantly older adults, and is the benchmark outbreak in the modern Greek WNV record.

For a Greek household outside the recurrently affected regional units, the risk is low but not zero. The 2018 Athens outbreak is the structural reminder that the vector (Culex pipiens) and the bird reservoir (resident and migratory species) are present across the country, and that any given year can see an outbreak in a new area. The EODY weekly bulletin carries the per-regional-unit case counts, the per-regional-unit affected-area list, and the year-on-year comparison.

The Greek national reference for WNV surveillance is EODY, the Hellenic National Public Health Organization. EODY runs the integrated human-entomological-veterinary surveillance in partnership with the regional public-health authorities, the Ministry of Rural Development and Food for veterinary surveillance, and the regional entomological agencies. EODY publishes weekly bulletins from late June through October each year, with the per-regional-unit detail and the running five-year median.

The clinical picture for a Greek household

For a Greek household in the affected regional units, the clinical reading is the same as for any other SE EU household. About 80 percent of WNV infections are asymptomatic. About 20 percent cause a self-limiting febrile illness, West Nile fever, with fever, headache, muscle aches, fatigue, and sometimes a maculopapular rash. The incubation period is 2 to 14 days, and symptoms last 3 to 6 days in most cases.

Fewer than 1 percent of infections progress to neuroinvasive disease, the form in which the virus reaches the brain and spinal cord, presenting as meningitis, encephalitis, or acute flaccid paralysis. A 2026 clinical review from Rome's Spallanzani Institute (PMID 42431607) reports a case-fatality rate as high as 17 percent for the neuroinvasive form. There is no specific antiviral and no human vaccine, so hospital care is supportive. Older adults (above 60), people with immunosuppression, and people with chronic conditions are at materially higher risk of severe disease.

The clinical decision point is early recognition, particularly in older or immunocompromised household members developing high fever, neck stiffness, confusion, weakness, or seizures within the transmission season, and prompt presentation to emergency services. The 2018 Athens outbreak is the structural reminder that the clinical picture in older adults can progress quickly, and that early presentation to hospital is the right response.

The Culex ecology of Greek conditions

The Culex pipiens ecology in Greek conditions has two specific features that affect the household protection layer. First, the warm Mediterranean summer extends the Culex activity window: biting activity that begins in the two hours after sunset continues at a higher background rate through the night than in cooler northern European conditions. Second, the urban Culex pipiens molestus biotype is well established in Greek cities, and the urban biotype is more strongly associated with indoor resting and indoor biting than the rural biotype. The combination means that the bedroom is the highest-exposure room in a Greek urban home, and the bedroom is the right place to start the household protection layer.

The source-reduction checklist for Greek conditions is the same Culex-specific one as elsewhere: blocked roof gutters, water butts, ornamental water features, used tyres stored flat, flooded cellars, and any standing water that has been undisturbed for ten days or more. In coastal and island Greek conditions, swimming pools not in regular use, decorative ponds, and any container that holds rainwater are the priority breeding sites to drain or cover.

The household protection layer for a Greek home

The household protection layer for a Greek household in the 2026 affected-area footprint is the four-part layer described in the Mosticare protection guide, applied to the Greek Culex ecology.

1. A net over the bed. For sleeping adults and children, an untreated mosquito net draped over the bed is the single most reliable chemical-free barrier to Culex bites. A framed canopy is preferable in a child's room. The Culex activity window in Greek summer conditions is long, and the net is the load-bearing protection during the sleeping hours.
2. Screens on bedroom windows and doors. Tight-fitting insect screens on the bedroom windows, and on any door left open for cross-ventilation in summer, prevent Culex from entering the room in the first place. The Greek residential standard is aluminium-frame fibreglass mesh of 16 by 18 mesh count or finer. Leave the screens in place through the off-season: leaving them in place through winter protects against the early-season Culex activity that begins in some Greek areas in April and May.
3. Source reduction around the house. A weekly walk to drain, dry, or cover any standing water that has been undisturbed for ten days or more. The Culex life cycle is 10 to 14 days in summer temperatures, so a weekly cadence is enough to break the cycle. In coastal and island Greek conditions, swimming pools not in regular use and decorative ponds are the priority.
4. Repellent during outdoor evening hours. Where presence on the terrace, in the garden, or at an outdoor event during the dusk-to-dawn window is unavoidable, an age-appropriate skin repellent (DEET 20 to 30 percent for adults, picaridin 20 percent as an alternative, lower DEET concentrations for younger children per the Greek Ministry of Health guidance, oil of lemon eucalyptus for those above 3 years) is the third line of defence.

The chemical layer (residual indoor spraying, outdoor ultra-low-volume adulticiding, larviciding of standing water) is a public-health tool used by municipal and regional vector control in coordination with EODY. It complements, but does not replace, the household physical-barrier layer.

The product-class claims for Greek consumers

The Greek consumer-protection reading is the same product-class separation as elsewhere in the SE EU WNV zone.

Untreated nets, framed canopies, gazebo nets, and baby or crib canopies are general textile products. They make no chemical claims, they carry no biocidal-product registration, and they are the right product class for the household physical-barrier layer. The claims that apply are "physical barrier", "chemical-free", "suitable for all ages including babies and pregnant women", and "reusable, washable". They are not "WHO-prequalified" and not "EU BPR authorised".

Treated nets carry a permethrin treatment, fall under EU BPR (Regulation (EU) No 528/2012), and in the global public-health context carry WHO prequalification status for use against malaria vectors in endemic tropical settings. Mosticare's treated nets are EU BPR authorised (permethrin, EU-0026815-0000) and built to WHO standards for use in malaria-endemic public-health programmes. WHO prequalification and BPR conformity apply only to treated nets, never to untreated household products.

Plug-in vaporisers, mosquito coils, citronella candles, and aerosol sprays are a different product class. Coils carry a documented PM2.5 harm and are a safety concern in enclosed spaces. Citronella candles are marginal in efficacy against Culex. Plug-in vaporisers vary widely in formulation. The framing is that the load-bearing protection is the net and the screen, and the supplement is a repellent on exposed skin during the dusk-to-dawn window.

Frequently asked questions for Greek households

Question: Where in Greece is West Nile virus circulating in 2026? As of 8 July 2026, ECDC records one affected Greek area on the European platform. The recurrently affected regional units are Central Macedonia (Thessaloniki, Pella, Imathia, Kilkis, Serres), East Macedonia and Thrace, and Western Greece. The EODY weekly bulletin carries the per-regional-unit detail.

Question: When is the Greek WNV season? The Greek WNV season runs from late June through mid-October, with the peak in August. The 2018 Athens-centred outbreak was the largest ever recorded in Greece, with more than 300 cases and over 50 deaths.

Question: Is there a vaccine? No. There is no human vaccine against WNV licensed for the general European population, and there is no specific antiviral. Hospital care is supportive. The protection layer sits in the household.

Question: Is a mosquito net enough to protect my family? An untreated net over the bed, plus tight-fitting window and door screens, plus source reduction around the home, plus age-appropriate repellent use during outdoor evening hours, is the complete household protection layer. The combination is what works.

Question: What is the official source for the case count? The Hellenic National Public Health Organization (EODY), at https://eody.gov.gr/en/disease/west-nile-virus/, is the Greek national reference. The ECDC weekly West Nile virus case-data report at https://wnv-weekly.ecdc.europa.eu/ carries the EU/EEA aggregate. The Mosticare Foundation threat-map data feed at https://mosticare.org/threat-map/data carries the consumer-facing summary aligned to the same data.

How to use this landing

This page is the Greek country landing in the Mosticare 2026 WNV coverage. It is paired with the European hub (the evergreen entry point) and the protection guide (the practical household-layer detail). The structural facts do not change; the case counts do. For the live numbers, the right place to look is the EODY weekly bulletin for the per-regional-unit detail, the ECDC weekly for the EU/EEA aggregate, and the Mosticare Foundation threat-map data feed for the consumer-facing summary. The household protection layer is the layer every Greek household in the affected region has under its own control, and it is the layer that operates at the human-vector interface, independent of the case count of any single week.

Sources

• European Centre for Disease Prevention and Control. West Nile virus infection page, surveillance and disease data, 2026 season.
• European Centre for Disease Prevention and Control. Communicable Disease Threats Report, 6 to 10 July 2026, Week 28.
• European Centre for Disease Prevention and Control. West Nile virus weekly case-data report, Week 28 (data 8 July 2026).
• Hellenic National Public Health Organization (EODY). Weekly West Nile virus epidemiological surveillance reports, June to October each season.
• Hellenic National Public Health Organization (EODY). Historical West Nile virus annual reports, 2010 to 2025.
• Spallanzani Institute, Rome. West Nile neuroinvasive disease: current management and emerging therapies, Reviews in Medical Virology, 2026. PMID 42431607.
• World Health Organization. West Nile virus fact sheet, continuously updated.
• European Commission. Regulation (EU) No 528/2012 (BPR), the regulatory frame for biocidal products.
• Mosticare Foundation. Threat-map data feed, weekly publication aligned with EODY and ECDC reporting.