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

Italy is the leading West Nile virus country in the 2026 European season. As of the ECDC week-28 weekly report, covering 6 to 10 July 2026, Italy carries five of the eleven affected areas now recorded across the EU/EEA footprint, more than any other country on the platform. The country has carried the largest annual WNV case load in the EU for most of the past decade, with the Po Valley in northern Italy as the historical epicentre and the Lazio region around Rome as an emerging southern focus. The 2025 Italian season finished at 779 cases and 72 deaths across nine regions, a case-fatality ratio of 9.2 percent, and the EpiCentro Istituto Superiore di Sanità integrated surveillance bulletins are the canonical national source for the 2026 trajectory.

This landing is written for Italian households in the affected regions and for travellers, seasonal workers, and second-home owners returning to rural properties in July and August. It covers the 2026 surveillance signal so far, the historical geography of Italian WNV transmission, the clinical picture, the household protection layer, and the national reporting infrastructure that an Italian household should know about.

The 2026 Italian season so far

The 2026 Italian WNV season opened in ECDC week 25 (data to 17 June) with two cases reported in the same week, one in the province of Caserta (Campania, NUTS3 ITF31) and one in the metropolitan area of Firenze (Toscana, NUTS3 ITI14). The two cases were geographically separate, on different coasts, with different regional health authorities and different climate zones. Italian local press filled in the details within days: the Caserta case was a 70-year-old man from Grazzanise, and the Firenze case was an adult woman from Bagno a Ripoli hospitalised in good clinical condition after the local health authority triggered disinfestation interventions.

By ECDC week 27 (data to 1 July 2026), the Italian count had reached three cases, with the historical Caserta and Firenze cases carrying forward and one additional case added within the Italian mainland. By ECDC week 28 (data to 8 July 2026), Italy had moved from three affected areas to five, the largest affected-area count on the 2026 ECDC platform, with ECDC framing the trajectory as "seasonal weather conditions are currently favourable for mosquito-borne transmission" and warning that "more cases are expected to occur in the coming weeks" [ECDC WNV weekly, week 28; ECDC CDTR, week 28; ISS EpiCentro arbovirosi portal].

The week-28 expansion is consistent with what Italian surveillance has been signalling since the season was formally declared open. A clinical review from Rome's Spallanzani Institute, published in Reviews in Medical Virology in 2026 (PMID 42431607), describes Italy's Lazio region as an emerging epicentre and frames West Nile virus as a climate-sensitive flavivirus now endemic in Europe. The review reports that fewer than 1 percent of infections become neuroinvasive, but that the neuroinvasive form carries a case-fatality rate as high as 17 percent, and that no antiviral and no human vaccine is licensed, so clinical management is supportive.

The Italian geography of WNV transmission

Northern Italy, the Po Valley in particular, has been the most consistently affected region of the EU since the early 2000s. The provinces of Pavia, Lodi, Cremona, Mantua, Modena, Ferrara, Bologna, Parma, Piacenza, and Rovigo recur in almost every annual WNV season. The Po Valley is a low-lying, intensively farmed, irrigated plain with high Culex pipiens breeding-site density in standing water from rice cultivation, irrigation channels, and floodplain accumulations. The combination of high mosquito density, a large resident and migratory bird population, and a dense human settlement is the structural driver of the consistent Po Valley case load.

Central Italy reports cases in most years. Tuscany (with Firenze as the recurrent focus) and parts of Lazio (with Rome and the surrounding province as the recurrent focus) appear in the EpiCentro bulletins annually. The 2026 Caserta case in Campania sits in southern Italy, in a province north of Naples, and the Italian surveillance system has been flagging the area as a recurrent WNV focus since the early 2010s. Naples itself and the surrounding metropolitan area have been affected in some years.

The Italian national reference for WNV surveillance is the Istituto Superiore di Sanità (ISS), which runs the integrated human-veterinary-entomological surveillance through the regional health authorities, the Istituto Zooprofilattico Sperimentale network for veterinary surveillance, and the entomological regional agencies. The EpiCentro portal (https://www.epicentro.iss.it/arbovirosi/) carries the public-facing bulletins, the Piano Nazionale Arbovirosi 2026 (the integrated national plan), and the historical annual reports.

The Italian blood donor screening programme

The Italian blood donor screening programme for West Nile virus, in place since 2008 to 2009, is one of the most comprehensive in Europe and is the reason that a non-trivial share of Italy's WNV detections every year are asymptomatic viraemic donors caught at the donation step rather than symptomatic patients caught at the GP. The screening is mandatory in affected provinces and is recommended nationally during the transmission season. It is a public-health tool, not a household tool, but it is part of the reason that the Italian case count is structurally higher than the clinical case count alone would suggest, and it is part of the reason that the Italian surveillance system is widely regarded as the most complete in Europe.

The screening also makes the asymptomatic reservoir visible to the surveillance system. An asymptomatic viraemic donor is someone who is currently infected, is not yet symptomatic, and would not otherwise have come to medical attention. The detection at the donation step triggers a nucleic-acid test confirmation and a lookback to the donor's recent travel and outdoor activity, and it is the public-health signal that the local Culex population is actively transmitting.

The clinical picture for an Italian household

For an Italian household in the affected provinces, the clinical reading of the 2026 season is sober. The great majority of WNV infections are mild or entirely without symptoms. About 20 percent of infections cause a self-limiting febrile illness, West Nile fever, with fever, headache, muscle aches, fatigue, and sometimes a maculopapular rash. The incubation period is typically 2 to 14 days, and symptoms last 3 to 6 days in most cases. Fewer than 1 percent of infections progress to neuroinvasive disease, but that small fraction is genuinely dangerous: the 2026 Spallanzani Institute review reports a case-fatality rate as high as 17 percent for the neuroinvasive form, and survivors sometimes carry lasting neurological effects.

Older adults (above 60), people with immunosuppression, and people with chronic conditions (diabetes, hypertension, chronic kidney disease) 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 clinical message is not a fear claim. The case-fatality of 17 percent applies to the neuroinvasive form, not to WNV infection overall. Because most infections are mild or asymptomatic, the risk of dying from a WNV infection picked up at random is far lower than that headline number. The clinical message is that the rare severe form deserves respect, and that the household protection layer is the load-bearing response for a pathogen with no vaccine and no antiviral.

The household protection layer for an Italian home

The household protection layer for an Italian household in the 2026 affected-area footprint is the same four-part layer described in the Mosticare protection guide, with the Italian-specific detail on the Culex ecology of the Po Valley and the rice-cultivation calendar.

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. A net is the right product class for a household with a baby, a toddler, an elderly relative, an asthmatic or allergic household member, or a preference for chemical-free products.
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. Aluminium-frame fibreglass screens of 16 by 18 mesh or finer are the European residential standard.
3. Source reduction around the house. The Po Valley rice-cultivation calendar means that standing water from irrigation channels, flooded fields, and drainage accumulations is part of the rural-urban interface from late April through September. A weekly walk around the house and garden to drain, dry, or cover any standing water that has been undisturbed for ten days or more lowers the local Culex biting pressure. In urban and peri-urban areas, the checklist is roof gutters, water butts, ornamental water features, and any container that holds water for more than a week.
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 Italian 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 with Bacillus thuringiensis israelensis or insect growth regulators) is a public-health tool used by municipal vector control. It complements, but does not replace, the household physical-barrier layer.

The product-class claims for Italian consumers

The Italian consumer-protection reading is to keep the product classes separate.

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, particularly for households with children, pregnant women, the elderly, or people with respiratory conditions. 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 Italian households

Question: Where in Italy is West Nile virus circulating in 2026? As of 8 July 2026, ECDC records five Italian affected areas on the European platform. The historical epicentre is the Po Valley (Pavia, Lodi, Cremona, Mantua, Modena, Ferrara, Bologna, Parma, Piacenza, Rovigo). Tuscany, Lazio, and parts of Campania (including Caserta) report cases in most years. The EpiCentro ISS bulletin carries the per-province detail.

Question: When is the Italian WNV season? The Italian WNV season runs from late June through October, with the peak in August. The 2025 season finished at 779 cases and 72 deaths across nine regions. The 2026 trajectory is structurally tracking the early, broad opening the climate and land-cover models predicted.

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 Istituto Superiore di Sanità (ISS), through the EpiCentro portal at https://www.epicentro.iss.it/arbovirosi/, is the Italian 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 Italian 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 EpiCentro ISS bulletin for the per-province 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 Italian 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 27 (2 July 2026) and Week 28 (data 8 July 2026).
• Istituto Superiore di Sanità, EpiCentro. Arbovirosi in Italia: sorveglianza integrata nazionale, Piano Nazionale Arbovirosi 2026, annual bulletins and weekly updates.
• Istituto Superiore di Sanità, EpiCentro. West Nile virus integrated surveillance annual bulletins, historical 2018 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 ISS and ECDC reporting.