Myggetal.dk
National vector surveillance
Weekly measurements from the University of Copenhagen make it easy to follow the season and compare activity with previous years.
Current activity ↓Status · August 2026
Vector activity and disease occurrence are not the same. Here we highlight current issues that are relevant when interpreting the graphs.
Last editorial update: 25 August 2026Ticks and public health
SSI classifies Bornholm, Tisvilde Hegn and the surrounding area, and Tokkekøb Hegn as known TBE risk areas in Denmark. In 2026, cases with presumed infection have been recorded in all three areas. Myggetal.dk shows the activity of castor bean ticks (Ixodes ricinus) – not the occurrence of TBE virus.
See SSI's current TBE risk areas ↗Biting midges and livestock health
BTV-3 has been detected in Denmark since August 2024, with outbreaks also recorded during the 2025/26 season. Biting midges of the genus Culicoides can transmit the virus. The graphs show midge activity, not whether midges are infected or the local outbreak risk.
See the current Danish BTV status ↗BTV surveillance
Since 2024, we have added more field sites to the surveillance of BTV vectors – biting midges of the genus Culicoides. This strengthens geographical coverage and provides a better basis for monitoring midge activity in more parts of Denmark.
Myggetal.dk shows general trends in vector activity. Always consult SSI and the Danish Veterinary and Food Administration for current health advice, outbreaks and official information.
National vector surveillance
Choose a group and explore the latest surveillance graphs.
Current surveillance covers mosquitoes, biting midges and ticks.
Species guide
Learn about identification, seasonality, habitats, nuisance, prevention and disease relevance. Open a card to see all information.
In brief
The graphs show average national activity from week to week and allow the current season to be compared with previous years.
The newest season is clearly highlighted in each graph.
Compare the current week with the same period in previous years.
Weather, habitat and time of day can create substantial local differences.
Knowledge behind the numbers
Outbreaks of bluetongue and Schmallenberg virus have demonstrated that vector-borne disease patterns can change rapidly in Europe. Travel, trade, climate and other environmental changes may affect vector distributions, seasonal activity and the risk of new disease outbreaks.
To protect human and animal health, animal welfare and livestock production, the Danish Veterinary and Food Administration funds national vector surveillance carried out by the Department of Veterinary and Animal Sciences at the University of Copenhagen. The data support risk assessment, early warning and monitoring of seasonal developments. Myggetal.dk shows general trends for Denmark and is not a local forecast.
We monitor seasonal activity and mosquito nuisance because very high activity can affect people and livestock. Surveillance may also detect changes in established or newly arriving species and supports assessments of West Nile, Usutu and Sindbis viruses, among others.
Biting midges are monitored particularly because they can transmit bluetongue and Schmallenberg viruses among cattle, sheep and other ruminants. Their activity is therefore important when assessing transmission risk and livestock welfare.
Tick measurements show when and how strongly castor bean ticks are active. This is relevant to exposure to infections including Lyme borreliosis and TBE, and to tracking species that may be introduced or spread towards Denmark.
Contact
Myggetal.dk is managed and scientifically maintained by René Bødker and Lene Jung Kjær, Department of Veterinary and Animal Sciences, University of Copenhagen.
