Country surveillance profile
Mosquito-borne disease in Sweden — 2025–2026 data
As of 17 June 2026, Mosticare tracks Sweden 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 |
|---|---|---|---|---|---|---|
| Sweden | 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 Sweden
Sweden's national communicable-disease authority is the Public Health Agency of Sweden (Folkhälsomyndigheten). According to ECDC's 2025 surveillance, Sweden reported zero locally acquired human West Nile virus cases — it is not among the 14 European countries that did. ECDC VectorNet (June 2025) records neither Aedes albopictus nor Aedes aegypti as established in Sweden; the only resident mosquito of arbovirus relevance is the common house mosquito, Culex pipiens.
Frequently asked questions
What mosquito-borne diseases is Sweden monitoring in 2026?
Mosticare tracks Sweden surveillance for West Nile virus, each sourced to the responsible national authority or ECDC.
Were there any West Nile virus cases caught in Sweden in 2025?
No. According to ECDC's 2025 surveillance, Sweden reported zero locally acquired (autochthonous) human West Nile virus cases. Sweden is not among the 14 European countries — led by Italy, Greece and France — that reported human cases that season. The Public Health Agency of Sweden states that no human West Nile virus cases have been recorded in the country.
Does the tiger mosquito (Aedes albopictus) live in Sweden?
Not as an established population. ECDC's VectorNet map (June 2025) lists Aedes albopictus as established in 16 EU/EEA countries — none of them Nordic. Sweden's climate has so far prevented the species from overwintering and establishing, so it is recorded as absent/not established rather than as a breeding population.
Could West Nile virus spread in Sweden in future?
West Nile virus is mainly carried by Culex pipiens, the common house mosquito, which is resident across Sweden. No WNV circulation has been detected in Sweden to date, but ECDC and Swedish authorities monitor the situation because the virus has been expanding northward in Europe. Any new figures would come from the Public Health Agency of Sweden and ECDC, not from Mosticare.
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.