EU West Nile Virus Outbreak: What Rising ECDC Cases Mean for Travellers

The EU West Nile virus outbreak is intensifying across southern and central Europe in August 2026, with the European Centre for Disease Prevention and Control (ECDC) and the World Health Organization Regional Office for Europe both confirming a sharp rise in confirmed human cases since mid-July. As of 5 August 2026, Greece alone had recorded 65 cases this season, including six deaths, while Italy, Romania, France, Spain and, for the first time, Germany have all reported locally acquired infections. For EU residents and holidaymakers travelling through affected regions this month, the practical answer is straightforward: risk is real but manageable with basic mosquito-bite prevention, and severe illness remains rare.

Where West Nile Virus Cases Are Rising in the EU

ECDC surveillance data confirms that West Nile virus transmission has expanded across at least six EU member states this season, with Italy and Greece bearing the heaviest burden and a first-ever locally acquired case now confirmed in Germany.

According to ECDC's weekly seasonal surveillance dashboard, last updated on 31 July 2026, 49 distinct areas across seven European countries have reported local West Nile virus transmission. Within the EU, Italy leads with 94 cases across 30 affected areas, concentrated in provinces including Novara, Cremona and Verona, with further cases in Milan, Florence, Naples, Padua, Modena and Ferrara. Spain and Romania have reported seven and five cases respectively, France has confirmed two cases, and Germany has recorded its first locally acquired case, a milestone that surveillance officials are watching closely as it suggests the virus's range is pushing further north.

Greece has seen the steepest recent acceleration. The WHO Regional Office for Europe reported on 24 July 2026 that Greek health authorities had confirmed 21 cases by 22 July, 14 of them in the preceding week alone. By 5 August, according to Greece's National Public Health Organisation (EODY) as reported by Euronews, that figure had climbed to 65 cases, with 54 involving severe neurological manifestations such as encephalitis, meningitis or acute flaccid paralysis. Six deaths have been recorded, all in patients over 65, with cases concentrated across 25 municipalities in the Attica, Thessaly and Central Macedonia regions.

For context on how this season compares, ECDC's World Mosquito Day update from 20 August 2025 recorded 335 locally acquired cases and 19 deaths across eight European countries by 13 August that year, a total it described at the time as the highest in three years. The pace of the 2026 season, particularly in Greece, indicates transmission is running well ahead of last year's already elevated trajectory, and ECDC expects the seasonal peak to fall in August or September as it typically does.

Symptoms and Who Faces the Highest Risk

Most people infected with West Nile virus experience no symptoms at all, but a small proportion develop serious neurological illness that can be fatal, particularly among older adults.

The WHO Regional Office for Europe estimates that 70 to 80% of infected people remain entirely asymptomatic. Around one in five who do develop symptoms experience West Nile fever: sudden onset of high temperature, headache, fatigue, body aches, nausea and sometimes a skin rash. This typically resolves within a week to ten days without specific treatment.

The greater concern is severe, or neuroinvasive, disease. WHO Europe puts the risk at approximately one in 150 infected individuals, but real-world data from this season's outbreak in Greece shows a far higher share of confirmed cases progressing to serious illness, likely because mild infections go undiagnosed. EODY, Greece's public health agency, estimates that for every single confirmed case involving the central nervous system, around 140 additional people have likely been infected with mild or no symptoms, pointing to substantial hidden circulation of the virus beneath the reported figures.

Adults over 65 face the highest risk of death; every fatality recorded in Greece this season has been in this age group.
People with weakened immune systems, including transplant recipients and those undergoing cancer treatment, face elevated risk of severe disease.
Outdoor and agricultural workers in affected rural and semi-rural areas face repeated exposure during peak mosquito activity at dawn and dusk.
Pregnant women should take particular care, as rare cases of mother-to-child transmission have been documented.

How West Nile Virus Spreads

West Nile virus spreads to humans through the bite of an infected Culex mosquito, which becomes infected after feeding on birds carrying the virus; it does not spread through ordinary human contact.

The transmission cycle depends on wild bird populations acting as reservoir hosts and mosquitoes acting as vectors. Humans and horses are considered "dead-end" hosts, meaning an infected person cannot pass the virus on to another person through coughing, touching or close contact. Rare exceptions exist through blood transfusion, organ transplantation, and from mother to child during pregnancy or breastfeeding, which is why blood services in affected EU regions apply seasonal donor deferral or screening measures once local transmission is confirmed.

Transmission intensity is closely tied to temperature and rainfall patterns. Warmer, wetter conditions accelerate mosquito breeding cycles and extend the viral incubation period inside the mosquito itself, which is part of why the transmission season now runs longer than it did a decade ago. Dr Hans Henri P. Kluge, WHO Regional Director for Europe, said on 24 July 2026 that "warmer temperatures and longer summers are giving mosquitoes more time and territory to transmit this virus." That assessment aligns with the geographic pattern seen this season, in which transmission has, for the first time, taken hold in Germany rather than remaining confined to the traditional Mediterranean and Balkan hotspots.

What This Means for EU Travellers and Communities

The practical impact of this outbreak falls unevenly. Wealthier travellers with flexible itineraries and air-conditioned accommodation can largely avoid peak mosquito exposure, while lower-income residents in affected regions, particularly older people in rural housing without window screens or air conditioning, face repeated evening exposure with fewer means to reduce it.

In Greece, where six deaths have already been confirmed this season, the burden is concentrated in exactly this group: elderly residents in agricultural and semi-rural municipalities across Attica, Thessaly and Central Macedonia, many of whom spend evening hours outdoors tending gardens, livestock or small farms during the hottest part of the day. Hospital capacity in affected areas is also under strain; EODY reported 20 people hospitalised in Greece by early August, eight of them in intensive care, adding pressure to regional health systems already managing summer heatwave admissions.

For the wider tourism economy, the risk is manageable rather than disruptive. No EU member state has issued travel restrictions in response to West Nile virus, and ECDC's guidance remains focused on personal prevention rather than avoidance of affected regions. That said, travellers with underlying health conditions or travelling with elderly relatives to Italy, Greece, Romania, Spain, France or affected parts of Germany should factor bite-prevention into trip planning, particularly for stays involving outdoor evenings in rural or semi-rural areas. For broader context on how EU public health authorities are responding to this and other seasonal risks, see Baba International's health coverage.

Why Cases Are Rising: The Wider Pattern

This season's acceleration is not an isolated spike but part of a multi-year trend that ECDC has been tracking since at least 2024, driven by a combination of climatic and ecological factors rather than any single event.

Three factors are converging. First, longer and hotter summers across southern and central Europe are extending the window in which Culex mosquitoes can breed and transmit the virus efficiently, a pattern Dr Kluge's comments directly reflect. Second, the geographic footprint is expanding: Germany's first locally acquired case this season follows a pattern already seen in France and Romania in prior years, where the virus establishes itself in new bird and mosquito populations before becoming an annual recurring risk. Third, surveillance itself has improved, meaning EU member states are now detecting and reporting cases that might previously have gone undiagnosed as unexplained summer fevers, which partly explains why year-on-year comparisons show consistent increases.

The practical consequence for EU health authorities is that West Nile virus is shifting from an occasional Mediterranean concern to a recurring, expanding seasonal threat that now requires monitoring in regions with no prior history of transmission. ECDC's decision to maintain weekly, rather than monthly, public reporting during peak season this year reflects that shift in institutional risk assessment.

Prevention Advice for Residents and Travellers

There is no vaccine or specific antiviral treatment for West Nile virus available in the EU, so prevention depends entirely on avoiding mosquito bites, particularly during the dawn and dusk hours when Culex mosquitoes are most active.

Use insect repellent containing DEET, icaridin or IR3535 on exposed skin, reapplying as directed on the product.
Wear long sleeves and trousers in light colours during outdoor evening activity in affected regions.
Sleep under mosquito netting or with screened windows where accommodation lacks air conditioning.
Empty or cover standing water around homes, gardens and balconies, since stagnant water is the primary mosquito breeding site.
Check ECDC's West Nile virus surveillance dashboard before travelling to or living in affected regions during peak season.

These steps mirror WHO Europe's own guidance, which Dr Kluge summarised as straightforward actions such as covering exposed skin, applying repellent and eliminating standing water near homes, measures that significantly reduce individual risk even as regional case counts rise. Readers researching broader EU consumer and public health guidance can find related analysis in Baba International's health section, alongside wider coverage at Baba International.

What EU Residents and Travellers Should Do Now

Anyone living in or travelling to Italy, Greece, Romania, Spain, France or the affected part of Germany this month should take concrete, immediate steps rather than waiting for symptoms to appear.

Buy repellent before you travel. DEET-based products above 20% concentration are most effective; pack enough for the full trip since availability can vary regionally.
Adjust evening plans in affected areas. Limit outdoor time between dusk and dawn, or apply repellent and cover up if outdoor evening activity is unavoidable.
Watch for symptoms for up to 14 days after a bite. High fever, severe headache, neck stiffness, confusion or muscle weakness warrant immediate medical attention, especially in anyone over 65 or immunocompromised.
Check national blood donation guidance. Several EU member states apply temporary donor deferrals in areas with confirmed local transmission; check with your national blood service before donating if you have visited an affected region.
Older relatives travelling to affected regions should be briefed specifically, given that every West Nile virus death recorded in the EU this season has been in a patient over 65.

Baba International Editorial Team

Our editorial team specialises in UK and EU personal finance, health policy, and economic analysis. All content is researched using authoritative sources including the ONS, NHS, Bank of England, ECB, and Eurostat.

Frequently Asked Questions

Is it safe to travel to Italy or Greece during the West Nile virus outbreak?

Yes, travel to Italy, Greece and other affected EU regions remains safe for most people. No EU member state has issued travel restrictions, and the vast majority of infections cause no symptoms; standard mosquito-bite prevention is sufficient for most travellers.

What are the first symptoms of West Nile virus infection?

Most infections cause no symptoms. When symptoms do occur, they typically begin three to 14 days after a bite with sudden fever, headache, fatigue, body aches and sometimes a rash, usually resolving within a week to ten days.

Which EU countries have confirmed West Nile virus cases in 2026?

As of ECDC's late-July and early-August 2026 surveillance updates, locally acquired cases have been confirmed in Italy, Greece, Romania, France, Spain and, for the first time this season, Germany.

Can West Nile virus spread between people?

No, West Nile virus does not spread through everyday human contact. It spreads through mosquito bites, and only rarely through blood transfusion, organ transplantation, or from mother to child during pregnancy or breastfeeding.