The Netherlands now has nine local West Nile cases and one death
What happened
The Netherlands is reporting a cluster of West Nile virus infections caught inside the country, and one person has died. According to RIVM, the Dutch national institute for public health, nine people had been confirmed with West Nile virus caught in the Netherlands as of 2 September 2026. The information was last updated on 3 September 2026. One of those nine was picked up through blood donation screening. The other eight were diagnosed in hospitals. The cases are spread across four provinces: Utrecht, North Brabant, North Holland and South Holland. That covers a good deal of the western Netherlands, including the areas around Amsterdam, Rotterdam and The Hague. On 28 August 2026, a person in Utrecht died after catching West Nile fever in the Netherlands. The virus has also been found in animals and insects there this year: five horses, six wild birds, and two batches of mosquitoes tested positive. West Nile virus lives in birds. The common house mosquito can pick it up when feeding on an infected bird, and can then pass it to other birds, to mammals such as horses, and to people. It does not spread from person to person.
Why this matters
The Netherlands is one of the most popular short-break destinations for UK travellers. It is an hour's flight, or an overnight ferry, and millions of us go every year. Most people would not put mosquito-borne illness and the Netherlands in the same sentence. That is exactly why it is worth knowing about. West Nile virus has been moving north across Europe for some years. Cases have been reported in southern Europe for a long time, but the Netherlands is a newer and more northerly setting. It is important to keep the risk in proportion, though, and RIVM does exactly that. Nine cases in a country of around 18 million people is a very small number. RIVM states that 'the risk of being bitten by an infected mosquito is still very small'. The useful takeaway is not to cancel anything. It is that basic bite prevention, which most of us only think about for tropical trips, is worth a moment's thought closer to home too.
What the evidence actually says
Here is the reassuring part, and it is genuinely reassuring. RIVM says that for the vast majority of people, West Nile infection is mild or causes no symptoms at all. Most people who catch it never know they had it. When symptoms do occur, they are usually flu-like: fever, headache, body aches, sometimes a rash, and tiredness that can linger. A small minority develop a serious illness affecting the brain and nervous system. That is what makes the virus dangerous, and it is why a death has been reported. Serious illness is more likely in older people and in those with weakened immune systems or certain long-term conditions. There is no vaccine for people, and no specific antiviral treatment. Care is supportive, which is why avoiding bites is the whole strategy. One more point on scale. The Netherlands is not unusual this year. West Nile virus is being reported in several European countries and beyond during the late-summer mosquito season, which typically runs into the autumn. This is a seasonal pattern, not a sudden emergency. What these figures do show is that the risk is no longer confined to southern Europe, and that it is worth checking travel health advice even for destinations that feel very familiar.
Practical advice
Avoiding mosquito bites is straightforward, and it works for a range of illnesses, not just this one. Use an insect repellent containing DEET on exposed skin. Reapply as the label says, especially after swimming or sweating. Cover up when mosquitoes are most active. For the common house mosquito, that is around dusk, at night and around dawn. Long sleeves and long trousers help. If your accommodation does not have screens or air conditioning, consider a mosquito net, and close windows at night where you can. Apply sunscreen first, then repellent on top. That order matters. If you develop a fever within two weeks of returning from a trip, contact your GP or 111 and tell them where you have been. Travel history genuinely changes how doctors think. If you are older, pregnant, or have a condition or medicine that affects your immune system, be a little more careful with bite prevention. Speak to your pharmacist or a travel clinic before you go if you are unsure. And a general travel point: if you take regular medicines, pack more than you need, keep them in hand luggage in their original packaging, and take a copy of your repeat prescription list. Delays happen, and pharmacies abroad cannot simply reissue a UK prescription.
What to know
As of 2 September 2026, RIVM has confirmed nine locally acquired human cases of West Nile virus in the Netherlands, across Utrecht, North Brabant, North Holland and South Holland. One person in Utrecht died on 28 August 2026 after catching the virus there. The virus also turned up in five horses, six wild birds and two mosquito pools this season. It spreads by mosquito bite, not from person to person. Most infections cause mild illness or none at all. A small minority cause serious neurological illness, mainly in older people and those with weakened immune systems. There is no human vaccine and no specific treatment, so preventing bites is the practical protection. RIVM stresses the risk of being bitten by an infected mosquito remains very small. Use DEET repellent, cover up at dawn and dusk, and see a doctor if you develop a fever within two weeks of travelling, mentioning where you have been. Sources: RIVM, 'Current information about West Nile fever', updated 3 September 2026, https://www.rivm.nl/en/west-nile-fever/current-information ; NaTHNaC TravelHealthPro, outbreak surveillance, 3 September 2026, https://travelhealthpro.org.uk/outbreaks ; RIVM, 'Person died from a West Nile virus infection acquired in the Netherlands', 26 August 2026, https://www.rivm.nl/en/news/person-died-from-west-nile-virus-infection-acquired-in-netherlands This article is for general information and does not replace advice from a doctor, pharmacist or other qualified healthcare professional. For personalised travel health advice, speak to your GP, pharmacist or a travel clinic before you go.
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