Country surveillance profile
Mosquito-borne disease in Denmark — 2025–2026 data
As of 17 June 2026, Mosticare tracks Denmark surveillance for West Nile virus. No autochthonous human cases are reported year-to-date in 2026. Each figure cites the responsible national or EU authority.
Last updated · 17 June 2026 · CC BY 4.0
The data
| Country / region | Disease | Cases | Deaths | Period | Source | Updated |
|---|---|---|---|---|---|---|
| Denmark | West Nile virus | 0 | 0 | 2025 transmission season | European Centre for Disease Prevention and Control (ECDC) — 2025 end-of-season West Nile virus surveillance (data to 3 December 2025) | 17 June 2026 |
About surveillance in Denmark
Denmark recorded zero locally acquired human West Nile virus cases in the 2025 season, per the European Centre for Disease Prevention and Control (ECDC), which reports the EU/EEA totals — Denmark is not among the 14 countries with cases. ECDC's VectorNet maps (June 2025) show the invasive Aedes albopictus mosquito is not established in Denmark, and Aedes aegypti is absent from mainland Europe. Denmark's national authority is Statens Serum Institut.
Frequently asked questions
What mosquito-borne diseases is Denmark monitoring in 2026?
Mosticare tracks Denmark surveillance for West Nile virus, each sourced to the responsible national authority or ECDC.
Were there any West Nile virus cases in Denmark in 2025?
No. According to the ECDC, Denmark reported zero locally acquired (autochthonous) human West Nile virus cases in the 2025 transmission season. Denmark is not among the 14 European countries that reported human cases that year. No autochthonous human WNV case has ever been recorded in Denmark.
Is the tiger mosquito (Aedes albopictus) established in Denmark?
No. ECDC's VectorNet 'current known distribution' map from June 2025 lists the 16 EU/EEA countries where Aedes albopictus is established, and Denmark — like the other Nordic countries — is not among them. The dominant relevant mosquito in Denmark is the native Culex pipiens, the enzootic vector for West Nile virus.
Has West Nile virus ever been found in Denmark at all?
Not in humans. Denmark's national surveillance programme (run by Statens Serum Institut and partners since 2011) found no West Nile virus RNA in mosquitoes or birds across 2011-2023. The first sign of the virus's presence came in autumn 2025, when antibodies were detected in four horses (reported by SSI in January 2026). This is a non-human signal and does not amount to confirmed local transmission to people.
Who tracks mosquito-borne disease in Denmark?
Statens Serum Institut (SSI), Denmark's national institute for infectious-disease preparedness, is the national authority; it runs the WNV/Usutu surveillance programme with the University of Copenhagen and the Copenhagen Bird Ringing Centre. Europe-wide totals are published by the ECDC. Mosticare is an independent civil-society aggregator that re-publishes these authorities' figures; it does not collect surveillance data itself.
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.