Country surveillance profile
Mosquito-borne disease in Italy, 2025-2026 data
As of 27 July 2026, Mosticare tracks Italy surveillance for West Nile virus and Chikungunya. Italy recorded the most human West Nile virus cases in the EU/EEA in 2025, 779 locally-acquired cases per ECDC's end-of-season cross-country report (data to 3 December 2025), the largest single-country WNV total in the region that year, concentrated in Lombardia, Veneto and Emilia-Romagna. Each figure cites the responsible national or EU authority.
Last updated · 27 July 2026 · CC BY 4.0
Key facts
Italy recorded the first mainland EU/EEA West Nile virus case of the 2026 season, first detected at the ECDC Communicable Disease Threats Report Week 27 reading (data to 1 July 2026): three locally-acquired cases across three NUTS3 sub-areas, IT Caserta (NUTS3 ITF31, Campania), IT Firenze (NUTS3 ITI14, Toscana) and a W27-additional NUTS3 area. Italy has since risen to 21 locally-acquired human cases at ECDC Week 29 (data to 15 July 2026), leading the European Region (which stands at 34 cases across 5 countries and 28 affected areas). The 2026 Piano Nazionale Arbovirosi integrated surveillance is in force; the ISS national bulletin with the per-NUTS3 W29 breakdown remains pending, so the sub-area detail is the last-confirmed W27 set.
Source: ECDC · Surveillance of West Nile virus infections in humans in Europe (weekly report, Week 29/2026, data to 15 July 2026); first-detection context from ECDC CDTR Week 27 (data to 1 July 2026) · verified 27 July 2026
Italy recorded the most human West Nile virus cases in the EU/EEA in 2025, 779 locally-acquired cases per ECDC's end-of-season cross-country report (data to 3 December 2025), the largest single-country WNV total in the region that year, concentrated in Lombardia, Veneto and Emilia-Romagna. Italy's own ISS integrated surveillance recorded 773 confirmed cases (770 autochthonous) as of its final 30 October 2025 bulletin, with the consolidated 2025 summary still pending.
Source: ECDC · Surveillance of West Nile virus infections in Europe (cross-country, data to 3 Dec 2025); Istituto Superiore di Sanità (ISS) for national detail · verified 15 June 2026
Italy reported 72 West Nile virus deaths in 2025, a case fatality rate of 9.2% across 779 confirmed cases, the highest national WNV death toll in the EU/EEA that season.
Source: Istituto Superiore di Sanità (ISS) · verified 25 May 2026
Italy reported 384 autochthonous (locally-acquired) chikungunya cases in 2025 across four regions, Emilia-Romagna, Veneto, Toscana and Lazio, out of 472 total cases including travel-imported ones, with no deaths. All Italian and French CHIKV clusters were declared closed by the end of 2025.
Source: Istituto Superiore di Sanità (ISS) · verified 31 May 2026
The data
| Country / region | Disease | Cases | Deaths | Period | Source | Updated |
|---|---|---|---|---|---|---|
| Italy | West Nile virussurveillance · 3 NUTS3 areas with confirmed autochthonous WNV transmission in 2026, last verified at W27 (ITF31 Caserta/Campania, ITI14 Firenze/Toscana, plus one W27-additional NUTS3). The W29 case count rose to 21 but the per-NUTS3 breakdown is not machine-readable in the ECDC weekly and the ISS national bulletin remains unpublished, so affected_areas stays at the last-confirmed 3 rather than an invented area count | 21 | 0 | 2026 transmission season (year-to-date) | ECDC · Surveillance of West Nile virus infections in humans in Europe (weekly report) | 27 July 2026 |
| Italy | Chikungunya | 0 | 0 | 2026 transmission season (year-to-date) | Istituto Superiore di Sanità (ISS) | 31 May 2026 |
| Italy | West Nile virus | 779 | 72 | 2025 transmission season | Istituto Superiore di Sanità (ISS), deaths + integrated WNV/Usutu surveillance; ECDC for the cross-country case count (data to 3 Dec 2025) | 15 June 2026 |
| Italy | Chikungunya | 384 | 0 | 2025 transmission season | Istituto Superiore di Sanità (ISS) | 31 May 2026 |
About surveillance in Italy
Italy carries the heaviest West Nile virus burden in the EU/EEA and runs an integrated WNV/Usutu and arbovirus surveillance plan (Piano Nazionale Arbovirosi), coordinated by the Istituto Superiore di Sanità. In 2025 it reported both the most WNV cases and the most WNV deaths in the region.
Frequently asked questions
What mosquito-borne diseases is Italy monitoring in 2026?
Mosticare tracks Italy surveillance for West Nile virus and Chikungunya, each sourced to the responsible national authority or ECDC.
Which country had the first mainland EU/EEA West Nile virus case in 2026?
Italy recorded the first mainland EU/EEA West Nile virus case of the 2026 season, first detected at the ECDC Communicable Disease Threats Report Week 27 reading (data to 1 July 2026): three locally-acquired cases across three NUTS3 sub-areas, IT Caserta (NUTS3 ITF31, Campania), IT Firenze (NUTS3 ITI14, Toscana) and a W27-additional NUTS3 area. Italy has since risen to 21 locally-acquired human cases at ECDC Week 29 (data to 15 July 2026), leading the European Region (which stands at 34 cases across 5 countries and 28 affected areas). The 2026 Piano Nazionale Arbovirosi integrated surveillance is in force; the ISS national bulletin with the per-NUTS3 W29 breakdown remains pending, so the sub-area detail is the last-confirmed W27 set.
Which European country had the most West Nile virus cases in 2025?
Italy recorded the most human West Nile virus cases in the EU/EEA in 2025, 779 locally-acquired cases per ECDC's end-of-season cross-country report (data to 3 December 2025), the largest single-country WNV total in the region that year, concentrated in Lombardia, Veneto and Emilia-Romagna. Italy's own ISS integrated surveillance recorded 773 confirmed cases (770 autochthonous) as of its final 30 October 2025 bulletin, with the consolidated 2025 summary still pending.
How many people died of West Nile virus in Italy in 2025?
Italy reported 72 West Nile virus deaths in 2025, a case fatality rate of 9.2% across 779 confirmed cases, the highest national WNV death toll in the EU/EEA that season.
How many autochthonous chikungunya cases did Italy report in 2025?
Italy reported 384 autochthonous (locally-acquired) chikungunya cases in 2025 across four regions, Emilia-Romagna, Veneto, Toscana and Lazio, out of 472 total cases including travel-imported ones, with no deaths. All Italian and French CHIKV clusters were declared closed by the end of 2025.
How many West Nile virus cases did Italy report in 2025?
Italy reported 779 West Nile virus cases and 72 deaths in 2025 (2025 transmission season), per Istituto Superiore di Sanità (ISS), deaths + integrated WNV/Usutu surveillance; ECDC for the cross-country case count (data to 3 Dec 2025).
How many Chikungunya cases did Italy report in 2025?
Italy reported 384 Chikungunya cases in 2025 (2025 transmission season), per Istituto Superiore di Sanità (ISS).
Sources
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About this data
Mosticare aggregates and re-publishes vector-borne disease surveillance from ECDC, EFSA, and national ministries of health. Mosticare is an aggregator, not a primary surveillance authority, every figure on this page cites the originating source and is independently verifiable. This is a partial aggregation; for the complete EU/EEA totals, ECDC is the primary source.
The data behind this page is published as free, machine-readable feeds under CC BY 4.0, the point-in-time incidence snapshot at /threat-map/feed.json (JSON Schema) and the multi-year trends at /threat-map/feed/trends.json (JSON Schema). See the live Europe threat map and the full data room.