Health authorities consistently observe an increase in cases of stomach illness during December each year.
The rise is closely linked to norovirus, often referred to as winter vomiting disease.
Norovirus is one of the most common causes of stomach illness worldwide and spreads particularly easily when many people are gathered closely together indoors.
Only a very small amount of the virus is needed to cause infection.
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As a result, a single infected person can quickly lead to multiple cases before an outbreak is detected.
Shared meals during the holidays
Medical experts point out that holiday parties and buffets play an important role in the spread of infection.
Many people share serving utensils and dishes, and food is often left out for extended periods.
This creates favorable conditions for the virus to survive and be transmitted via hands and food.
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These circumstances differ from much of the rest of the year, when fewer people share food in this way. Holiday traditions therefore create a particular risk.
Prevention in everyday life
Thorough handwashing with soap and water is essential, as norovirus is not always eliminated by alcohol-based hand sanitizers.
Prevention is not only a matter of personal hygiene but also of shared responsibility.
When guests use serving utensils correctly, take clean plates, and stay home when they are ill, the risk of infection is significantly reduced.
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When illness occurs
Symptoms typically appear 1 to 2 days after exposure.
The illness usually lasts 1 to 2 days, though it may persist longer in children. Common symptoms include nausea, vomiting, and diarrhea.
There is no specific treatment for the virus itself. Maintaining adequate fluid intake is therefore important, and medical advice should be sought if there are signs of dehydration.
Social togetherness is not the problem in itself, but without mutual consideration, close social contact can increase the risk of illness.
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Sources: Statens Serum Institut, and Netdoktor.
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