Country surveillance profile
Mosquito-borne disease in Finland — 2025–2026 data
As of 17 June 2026, Mosticare tracks Finland 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 |
|---|---|---|---|---|---|---|
| Finland | 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 Finland
According to ECDC and EFSA joint surveillance, Finland reported no locally acquired human West Nile virus cases in 2025; it is not among the 14 European countries that did. The invasive mosquitoes Aedes albopictus and Aedes aegypti are not established in Finland (ECDC VectorNet). National infectious-disease surveillance is run by the Finnish Institute for Health and Welfare (THL) through the Finnish National Infectious Diseases Register.
Frequently asked questions
What mosquito-borne diseases is Finland monitoring in 2026?
Mosticare tracks Finland surveillance for West Nile virus, each sourced to the responsible national authority or ECDC.
Is West Nile virus present in Finland?
No locally acquired human West Nile virus cases were reported in Finland in 2025, and the virus is not known to circulate there. According to ECDC and EFSA, Finland was not among the 14 European countries reporting locally acquired human WNV cases that season. The common house mosquito (Culex pipiens), the main potential vector, is widespread in Finland, but the climate is not currently considered suitable for sustained WNV transmission.
Are tiger mosquitoes (Aedes albopictus) found in Finland?
No. According to ECDC's VectorNet 'current known distribution' map (June 2025), Aedes albopictus is not established in Finland or anywhere in the Nordic region. In the EU/EEA it is established across 16 mainly central and southern European countries, none of them Nordic.
Which mosquito-borne disease is actually a concern in Finland?
Finland's endemic mosquito-borne arbovirus is Sindbis virus, which causes Pogosta disease — a febrile illness with rash and joint pain occurring in late summer, transmitted via Culex and Culiseta mosquitoes. West Nile virus, dengue and chikungunya are not endemic; cases in Finland are travel-related. Tick-borne encephalitis (a tick-borne, not mosquito-borne, disease) is also monitored by THL.
Who tracks infectious diseases in Finland?
The Finnish Institute for Health and Welfare (THL) is the national public-health authority. It maintains the Finnish National Infectious Diseases Register under the Communicable Diseases Act, collecting notifications from doctors and laboratories. Finland also contributes data to ECDC's European surveillance, including the joint ECDC/EFSA West Nile virus reports.
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.