Denmark's Queen Margrethe II has tested positive for Covid-19, according to a statement issued by the royal family.
Margrethe, 81, is only showing mild symptoms, the Danish royal family said on Wednesday.
She tested positive the night before and is now staying at Amalienborg Castle in Copenhagen.
Her winter holiday, planned in Norway and due to begin on Wednesday, has been cancelled.
The court is following the health authorities' guidelines.
Margrethe has been vaccinated three times against Covid-19.
50,000 new cases per day
Denmark is currently recording some 50,000 new cases of Covid-19 every day, but thanks to a high vaccination rate and the milder Omicron strain, the number of people in need of intensive care is relatively low.
These factors led the Danish government to ease almost all of its pandemic restrictions in early February.