# Tick-borne encephalitis trends in Northern Europe

> Live situation record from CLSTR: https://clstr.news/situations/tick-borne-encephalitis-trends-in-northern-europe
> Updated: 2026-09-16T03:45:09.000Z. Sources: 7. Developments: 2.

Tick-borne encephalitis (TBE) activity has been noted in Northern Europe. In Denmark, the Statens Serum Institut identified Hals in North Jutland and Marielyst on Falster as two new potential risk areas, following the criteria of at least two suspected cases within a three-year period.

In Sweden, the Public Health Agency reported a record number of TBE cases, with 448 reported up to mid-September, surpassing the 392 cases recorded during the same period in 2023. Officials noted that the increase may be linked to weather patterns, tick prevalence, and host populations such as deer and rodents. The agency has recommended vaccination for most adults and children over age three in southern Sweden.

## Claims

- 448 cases of TBE were reported in Sweden up to September 14. (corroborated by 3 sources)
- The number of TBE cases this year is the highest ever recorded for this period. (corroborated by 3 sources)
- There were 392 reported cases of TBE during the same period in 2023. (corroborated by 3 sources)
- About one in three TBE infections spread to the brain or meninges. (corroborated by 3 sources)
- TBE cases in Sweden have increased by roughly 6 percent annually over the last decade. (corroborated by 3 sources)
- The Public Health Agency recommends TBE vaccination for all adults and children over three in much of southern Sweden. (corroborated by 3 sources)

## Timeline

### 2026-09-16: Sweden reports record number of TBE virus cases

Sweden reports a record 448 TBE cases up to September 14, the highest for this period ever recorded. The Public Health Agency urges vaccination in southern Sweden as cases rise.

4 sources. https://clstr.news/cluster/sweden-reports-record-number-of-tbe-virus-cases

### 2026-08-29: Denmark identifies two new potential TBE risk areas

Denmark's Statens Serum Institut has identified Hals and Marielyst as new potential risk areas for Tick-borne encephalitis (TBE) following the spread of infected ticks.

3 sources. https://clstr.news/cluster/denmark-identifies-two-new-potential-tbe-risk-areas

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Cite as: Tick-borne encephalitis trends in Northern Europe. CLSTR, https://clstr.news/situations/tick-borne-encephalitis-trends-in-northern-europe