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Europe mosquito-borne disease data
Mosticare publishes a free, machine-readable feed of vector-borne disease incidence across the EU and EEA, aggregated from ECDC, EFSA and national ministries of health. As of 27 July 2026 it tracks 59 records, West Nile virus, chikungunya and dengue across 39 countries, plus 11 sourced key facts. Licensed CC BY 4.0 for AI summarizers and agentic systems.
Last updated · 27 July 2026 · CC BY 4.0
Key facts
The first human West Nile virus case of the 2026 season in the European Region (EU/EEA + neighbourhood) was reported in the Vardar region of North Macedonia, one locally-acquired case, first appearing in the ECDC weekly West Nile virus surveillance report dated 3 June 2026. As of ECDC Week 29/2026 (data to 15 July 2026), the European Region total has risen to 5 countries, 34 locally-acquired human cases and 28 affected areas: Italy 21 (the mainland EU/EEA leader, up from 6 at W28), Greece 7 (up from 1), North Macedonia 2, Romania 2 and Spain 2 (up from 1). North Macedonia is an EU candidate country included in ECDC's weekly EU/EEA-and-neighbourhood WNV surveillance.
Source: ECDC · Surveillance of West Nile virus infections in humans in Europe (weekly report, Week 29/2026, data to 15 July 2026) · verified 27 July 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.
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
Greece had the second-most human West Nile virus cases in the EU/EEA in 2025, 96 locally-acquired cases (76 of them neuro-invasive) and 9 deaths, behind only Italy (779). Attica was the main hotspot. The figures are EODY/NPHO's final 2025 count, consistent with ECDC's cross-country report.
Source: EODY · National Public Health Organization (NPHO), Greece · verified 14 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
France had the largest autochthonous chikungunya outbreak in continental Europe in 2025, 809 locally-acquired cases across 79 transmission episodes (1 May, 30 November), with symptom onset between 27 May and 13 November. It was the largest continental-European autochthonous CHIKV outbreak on record for that year.
Source: Santé publique France · enhanced arbovirus surveillance · 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
Romania was among the first EU/EEA-and-neighbourhood countries to report 2026 autochthonous West Nile virus cases, 2 locally-acquired cases (both within the 2 June to 30 October 2026 enhanced-surveillance window, 0 deaths), and holds at 2 through the ECDC Week 29 reading (data to 15 July 2026). Romania no longer leads the European count: at Week 29 Italy leads with 21 cases and Greece is second with 7, within a European Region total of 34 locally-acquired human cases across 5 countries and 28 affected areas (Italy 21, Greece 7, North Macedonia 2, Romania 2, Spain 2). Romania was a new 2026 reporting country (0 cases through W26, 2 from W27); the ECDC weekly directs readers to the joint monthly report at https://wnv-monthly.ecdc.europa.eu/ for the county/NUTS3 breakdown. INSP/CNSCBT weekly informer corroborates both RO cases as autochthonous.
Source: ECDC · Surveillance of West Nile virus infections in humans in Europe (weekly report, Week 29/2026, data to 15 July 2026); Institutul Național de Sănătate Publică (INSP) · CNSCBT weekly informer · verified 27 July 2026
French Guiana (ISO-3166-1 alpha-2 GF, French overseas territory in South America) is reporting the largest active chikungunya cluster in French overseas territories in 2026, with 1,057 cumulative biologically-confirmed cases through Santé publique France Direction régionale Guyane's semaine 27 bulletin (week 29 Jun to 5 Jul 2026, published 9 Jul 2026), the S27 weekly count 44 (données non consolidées). Cumulative hospitalisations reached 201 across the three CHU de Guyane sites (majority classic form, with 21 unusual forms and 8 severe forms); 1 death classified by SpF as unrelated to chikungunya. Under the ORSEC arboviroses plan the Littoral Ouest and Savanes remain the most active foyers, the Île de Cayenne has seven foyers under surveillance and the Maroni is in sporadic transmission. The cluster is the largest sustained autochthonous chikungunya transmission reported from an EU-outermost-region in 2026 and the most material French-overseas escalation point in the 2026 chikungunya arc. Vector: Aedes aegypti (yellow-fever mosquito) is the dominant GF chikungunya vector (Aedes albopictus is also established in GF but is not the principal outbreak vector here). The cluster is intentionally NOT folded into the metropolitan FR/CHIKV 2026 row (which covers metropolitan France only), the territory-scope decision recorded in MOS-2831 selected Option B (separate FR-GF record) over Option A (extend FR national row), preserving the metropolitan vs overseas scope separation that SpF's separate-bulletin practice operationalises.
Source: Santé publique France, Direction régionale Guyane (SpF-Guyane weekly Bulletin régional Guyane: Surveillance épidémiologique du chikungunya, semaine 27, published 9 Jul 2026) · verified 27 July 2026
The first 2026 autochthonous (locally acquired) human West Nile virus case in metropolitan France was reported in the Pyrénées-Orientales département (Occitanie). Santé publique France's national reinforced arbovirus bulletin of 23 July 2026 (data to 20 July 2026) recorded 1 locally-acquired human WNV case there, 0 deaths, the first of the metropolitan-France 2026 season. It is SpF-sourced and not yet reflected in the ECDC weekly WNV report (which at Week 29, data to 15 July 2026, lists Italy 21, Greece 7, North Macedonia 2, Romania 2 and Spain 2); France would become the sixth ECDC-reporting country when the case is picked up. WNV is transmitted by Culex mosquitoes; most human infections are silent, and there is no licensed human vaccine or specific antiviral, so avoiding bites is the primary individual defence.
Source: Santé publique France · national reinforced arbovirus bulletin (chikungunya-dengue-Zika et-17, 23 July 2026, data to 20 July 2026) · verified 27 July 2026
The first 2026 autochthonous (locally acquired) dengue in metropolitan France was detected in Occitanie, 2 cases, one in the Tarn and one in l'Hérault. Santé publique France's national reinforced arbovirus bulletin of 23 July 2026 (data to 20 July 2026) recorded them as the first metropolitan-France autochthonous dengue of the year, 0 deaths. Transmission is by the Aedes albopictus tiger mosquito, established across much of southern and central metropolitan France; the same bulletin reported 231 imported dengue cases for 1 May to 19 July 2026, the travel-associated reservoir that can seed local transmission. Dengue mosquitoes bite mainly by day, so personal protection and physical barriers are the primary individual defence.
Source: Santé publique France · national reinforced arbovirus bulletin (chikungunya-dengue-Zika et-17, 23 July 2026, data to 20 July 2026) · verified 27 July 2026
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Sources
- Santé publique France, bilan national West Nile 2025 (édition nationale, deaths); ECDC for the cross-country case count (data to 3 Dec 2025)
- Istituto Superiore di Sanità (ISS), deaths + integrated WNV/Usutu surveillance; ECDC for the cross-country case count (data to 3 Dec 2025)
- Istituto Superiore di Sanità (ISS)
- Junta de Andalucía · Consejería de Salud y Consumo
- Direção-Geral da Saúde (DGS) · REVIVE programme
- IASaúde · Instituto de Administração da Saúde da Madeira
- RENAVE · Centro Nacional de Epidemiología (ISCIII), final 2025 national report (deaths); ECDC for the cross-country case count (data to 3 Dec 2025)
- Santé publique France, bilan national chikungunya/dengue/Zika 2025 (édition nationale, enhanced arbovirus surveillance)
- EODY · National Public Health Organization (NPHO), Greece
- Institut za javno zdravlje Srbije „Dr Milan Jovanović Batut“
- Institutul Național de Sănătate Publică (INSP) · CNSCBT
- Nemzeti Népegészségügyi és Gyógyszerészeti Központ (NNGYK)
- ECDC · Surveillance of West Nile virus infections in Europe (monthly report, data to 3 December 2025)
- Santé publique France · national reinforced arbovirus bulletin (chikungunya-dengue-Zika et-17, 23 July 2026)
- ECDC · Surveillance of West Nile virus infections in humans in Europe (weekly report)
- Istituto Superiore di Sanità (ISS)
- Junta de Andalucía · Consejería de Sanidad, Presidencia y Emergencias
- Santé publique France · enhanced arbovirus surveillance
- Santé publique France, Direction régionale Guyane (SpF-Guyane weekly Bulletin régional Guyane: Surveillance épidémiologique du chikungunya, semaine 27, published 9 Jul 2026)
- European Centre for Disease Prevention and Control (ECDC), 2025 end-of-season West Nile virus surveillance (data to 3 December 2025)
- Public Health Center of the Ministry of Health of Ukraine; Deputy Minister of Health & Chief Sanitary Doctor Ihor Kuzin
- National Center for Disease Control and Prevention (NCDC) / Ministry of Health of Armenia, reported via ARMENPRESS
- Samoilova TI, Votiakov VI, Titov LP, Central European Journal of Public Health (2003)
- European Centre for Disease Prevention and Control (ECDC)
- European Centre for Disease Prevention and Control (ECDC)
- Rospotrebnadzor (Federal Service for Surveillance on Consumer Rights Protection and Human Wellbeing), surveillance review, Putintseva et al., 2025
- Hubálek & Halouzka, Emerging Infectious Diseases (US CDC), 1999, WNV reported from Azerbaijan; no national autochthonous case count is published
- National Center for Disease Control and Public Health of Georgia (NCDC)
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.