Based on data submitted up until and including 23 September 2026.

Epidemiological summary

Since the beginning of 2026 and as at 23 September 2026, two countries in Europe have reported locally acquired1 cases of dengue: Italy (47 cases) and France (5 cases).

Since last week’s update, Italy reported 10 new locally acquired dengue cases. The cumulative number of locally acquired cases in Italy is 47, distributed across 7 clusters2, 4 of which are newly identified: three in the Firenze NUTS 3 region (Campi Bisenzio, Signa and Sesto Fiorentino) and one in the Napoli NUTS 3 region (Ischia). All clusters are currently active.

No new locally acquired dengue cases have been reported by France since last week’s update. The cumulative number of locally acquired cases in France remains 5, distributed across 4 clusters. No clusters are currently active.

Please find the current dengue risk assessment for mainland EU/EEA on ECDC’s dedicated dengue webpage.

Introduction

Dengue is a mosquito-borne viral disease that is increasingly emerging in Europe, with locally acquired cases reported in several EU/EEA countries. In the light of this development, the European Centre for Disease Prevention and Control has implemented seasonal enhanced weekly surveillance to monitor the occurrence of cases in the EU/EEA. The primary objective is to inform public health authorities and support the implementation of appropriate response measures. This includes assessing the risk of dengue transmission through Substances of Human Origin (SoHO).
Dengue is a notifiable disease at the EU level and cases are reported in accordance with the EU case definition. The table and map in this report show the countries and areas where dengue cases – and their corresponding case numbers – have been reported to the European surveillance portal for infectious diseases (EpiPulse Cases). In most instances, the first case reported in a cluster should be confirmed in accordance with the EU case definition. In specific situations, and at the discretion of the reporting country, a probable case may be used to designate a new cluster when confirmation is not available within a reasonable timeframe.
Please note that cases acquired in Portuguese and Spanish Outermost Regions are included. However, due to the distinct epidemiological situation and differences in surveillance systems, cases acquired in the French Outermost Regions are not included.
Here we present the report as at 23 September 2026.

Overview of dengue cases in the EU/EEA

Countries and regions with locally acquired dengue cases in 2026 at 23 September 2026

*Nomenclature of territorial units for statistics

**Local administrative unit

When importing case_summary.csv in MS Excel, please do not forget to select Unicode (UTF-8) as encoding.

Case summary (.csv)

Spatial distribution of locally acquired dengue cases in 2026 at 23 September 2026

Please follow the link to open the interactive dashboard.

  1. Cases acquired within the reporting country. ↩︎
  2. Clusters are epidemiologically- and/or microbiologically-linked cases as defined by national authorities. Clusters can also be single, sporadic cases. In most instances, reporting to ECDC is initiated only after a confirmed case is identified in a cluster. In specific situations, and at the discretion of the reporting country, a probable case may be used to designate a new cluster when confirmation is not available within a reasonable timeframe; probable cases are subsequently included once a cluster is reported. Clusters are reported as “closed”, 45 days after the last reported date of symptom onset (or any other relevant date when the date of onset is missing). This 45-day period accounts for the estimated time from symptom onset until viraemia levels are sufficient to infect a mosquito (four days), the lifespan of an Aedes mosquito in natural circumstances (23 days) and the maximum intrinsic incubation period (14 days), with an added four-day safety margin for clinical diagnosis of new cases. ↩︎