Flu Epidemic Imminent in Netherlands: RIVM Warns of Surge

Many people in the Netherlands are experiencing respiratory symptoms and the annual flu season appears to be starting. Health officials are closely monitoring a rise in influenza cases, with indicators suggesting a potential epidemic is on the horizon.

According to the National Institute for Public Health and the Environment (RIVM), the number of people visiting their general practitioner (GP) with flu-like symptoms has been increasing. Last week, 51 out of every 100,000 inhabitants sought medical attention for these symptoms. This figure surpasses the epidemic threshold of 46 per 100,000, a level not seen since 2020. The week prior, the rate was 40 per 100,000.

Experts from RIVM, Erasmus MC, and the Netherlands Institute for Health Services Research (Nivel) have observed a growing number of infections involving the influenza virus. Analysis of samples collected from individuals experiencing respiratory symptoms reveals that 13% tested positive for the flu last week, a slight increase from 12% the previous week. GPs also found the flu virus in 37% of samples taken from patients with respiratory symptoms, up from 18% to 22% in the past week. Laboratories across the Netherlands are reporting a similar trend.

While influenza is a primary concern, it’s important to note that other viruses can also cause respiratory infections, leading to symptoms like nasal congestion, sneezing, coughing, and sore throat, sometimes accompanied by fever.

The current increase in cases is prompting concerns about potential strain on healthcare resources. Recent figures indicate a jump to around 51 per 100,000 people visiting GPs with flu-like symptoms, and a more dramatic leap to 118 per 100,000 reported by memesita.com. Dr. Annelies van der Meer, an epidemiologist at RIVM, noted that the speed of this increase suggests a highly contagious strain is circulating.

Looking back, the flu epidemic officially began slightly earlier last year, at the end of January, peaking in early February. The last major flu wave in the Netherlands occurred in 2018, affecting an estimated 900,000 people and resulting in approximately 9,000 deaths. Hospitalizations were significant, and a similar surge could potentially overwhelm hospital capacity, potentially leading to some facilities being unable to accept new patients.

Dutch virologists have been anticipating this increase, particularly with the rise in cases across Europe. The H3N2 flu strain, currently circulating in the United Kingdom, is expected to reach the Netherlands soon. H3N2 infections generally cause more severe symptoms, including higher fever, stronger coughing, and increased nasal congestion. Older adults and individuals with underlying health conditions are considered particularly vulnerable.

The World Health Organization has reported increased flu activity in December, earlier than the typical January-February peak. The flu vaccine is typically offered in November to allow two weeks for immunity to develop, providing roughly 35 percent protection against illness and 40 percent against hospitalization.

Preventing the Flu

There are several steps individuals can take to reduce their risk of contracting the flu:

• Wash your hands regularly: Frequent handwashing with soap and water is a simple yet effective way to prevent infection.
• Avoid close contact with sick individuals: Maintaining distance from those who are ill can help limit exposure to the virus.
• Prioritize adequate sleep: A well-rested body is better equipped to fight off viruses.
• Eat a healthy diet: A strong immune system, supported by a nutritious diet rich in vitamins, can help combat viral infections.
• Use disposable tissues: Dispose of used tissues immediately to prevent the spread of the virus.
• Clean frequently touched surfaces: Regularly disinfecting surfaces like doorknobs and phones can help eliminate the virus.
• Ventilate indoor spaces: Opening windows to allow fresh air circulation can reduce the concentration of virus particles in the air.

While these preventative measures are helpful, it’s important to remember that even with precautions, illness can occur. If you are experiencing symptoms of a cold, a nose rinse can be particularly effective.

December 21, 2025, Dutch virologists were already anticipating a flu epidemic in the coming weeks, as cases rose across Europe.