COVID-19 in Denmark
Current COVID-19 activity in Denmark — based on ECDC ERVISS weekly data from Statens Serum Institut (SSI).
Current situation: COVID-19
In week 15 of 2026, activity of COVID-19 in Denmark is low. The trend — derived from clinical surveillance — is falling.
The classification is based on the ECDC ERVISS weekly reports, drawing on COVID-19 surveillance data from Statens Serum Institut (SSI) via sentinel primary-care surveillance, wastewater monitoring and genomic sequencing. Seasonally, infection waves in Denmark typically peak during winter, with occasional summer waves driven by new variants; activity is usually markedly lower in late spring between waves. How severe a given season becomes depends on the circulating virus variant and the population's immune status, among other factors.
Data sources and methodology
The current picture for Denmark is built on the European Respiratory Virus Surveillance Summary (ERVISS), published weekly by the European Centre for Disease Prevention and Control (ECDC). Statens Serum Institut (SSI) is the national public-health authority that feeds ERVISS with sentinel primary care and virology data. Denmark combines sentinel primary-care surveillance with wastewater monitoring and genomic sequencing, so the ERVISS signal for Denmark is especially well-triangulated.
ECDC ERVISS
ERVISS is ECDC's weekly pan-European surveillance summary for influenza, SARS-CoV-2 and RSV. National authorities — in Denmark's case Statens Serum Institut (SSI) — submit harmonised indicators every week, which ECDC publishes in a standardised dataset on Thursdays. Using ERVISS rather than each country's native portal ensures cross-country comparability.
ILI / ARI consultation rates and positivity
Statens Serum Institut (SSI) operates a sentinel network of general practices that report weekly rates of patients consulting for influenza-like illness (ILI) or acute respiratory infection (ARI). A subset of patients is swabbed and tested by reference laboratories, producing pathogen-specific positivity rates for flu, SARS-CoV-2 and RSV.
Why this source
Combining consultation incidence with virological positivity yields a pathogen-specific weekly incidence signal (ILI × positivity / 100). This is the standard European methodology and provides a more robust view than either indicator alone — consultation rates capture illness burden, positivity confirms which pathogen is driving it.
Qualitative classification
The “low”, “moderate” and “high” categories follow seasonal reference values and epidemiological thresholds calibrated to match our classifications for other countries. The ILI × positivity / 100 product is scaled to comparable thresholds using a divisor of 3, which aligns European sentinel peaks with the consultation-equivalent scale used elsewhere. Data refreshes weekly when ECDC publishes the latest ERVISS update, typically on Thursdays.
Frequently asked questions
How is COVID-19 monitored in Denmark today?
Statens Serum Institut integrates COVID-19 into its broader respiratory-virus surveillance. Core indicators include sentinel-laboratory positivity, hospital and ICU admissions for severe acute respiratory infection, wastewater detection of SARS-CoV-2, and extensive variant sequencing. Denmark has one of Europe's most active wastewater surveillance programmes for SARS-CoV-2. Weekly results are reported to ECDC ERVISS.
Why is wastewater surveillance so prominent in Denmark?
After clinical testing was scaled back, Statens Serum Institut invested heavily in wastewater-based monitoring as a cost-effective way to track SARS-CoV-2 circulation at community level. Denmark operates one of Europe's most established wastewater surveillance networks, producing weekly indicators that complement clinical positivity and hospital data. These signals often detect rising activity slightly ahead of hospital admissions.
When do COVID-19 waves happen in Denmark?
Denmark's COVID-19 pattern is less tightly seasonal than flu. Autumn and winter waves overlapping with flu and RSV are consistent, but summer upticks driven by new variants have also been observed. SSI watches wastewater, positivity, and hospital-admission trends to identify when activity has shifted from baseline to elevated.
Who is eligible for a COVID-19 booster in Denmark?
Danish autumn COVID-19 booster campaigns are coordinated by the Sundhedsstyrelsen and typically target adults aged 65 and above, pregnant women, people with chronic or immunosuppressive conditions, residents of long-term-care facilities, and healthcare workers. Vaccines are administered through GPs and regional vaccination centres. Statens Serum Institut publishes uptake data alongside weekly virological surveillance.
Are new variants still tracked in Denmark?
Yes. Denmark sequences SARS-CoV-2 samples at volumes that have historically placed it among the EU's most intensive surveillance countries. Statens Serum Institut publishes variant-trend reports and transmits them to ECDC ERVISS. Most emerging lineages cause illness comparable to their predecessors, but variants with substantial immune escape can drive larger waves.
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