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Monday, 17 August 2026

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West Nile virus detected in blood donor in the Netherlands

A blood donor in Utrecht has contracted the West Nile virus, marking the first infection in the Netherlands since 2020.

West Nile virus detected in blood donor in the Netherlands
Photo: Someone Not Awful · Wikimedia Commons · CC BY-SA 4.0

A blood donor from the province of Utrecht has tested positive for the West Nile virus, reports the RIVM. This is the first recorded infection of the virus in the Netherlands since 2020. The donor exhibited mild symptoms, and the infection was detected during scientific research by blood bank Sanquin among blood donors.

The infection occurred in August, and the donor has not recently traveled abroad, which excludes the possibility of a foreign infection. According to health authorities, the health risks associated with the West Nile virus are considered low.

The West Nile virus, typically spread by mosquitoes, can sometimes cause illness in humans, but many infections are asymptomatic. The virus is found in birds and can be transmitted to humans via mosquitoes.

West Nile virus detected in blood donor in the Netherlands
Photo: Frans Berkelaar · Wikimedia Commons · CC BY 2.0

Nevertheless, the West Nile virus remains rare in the Netherlands, and the health risk to the general population is deemed limited. However, this is the first report of the virus in nearly six years, prompting increased attention to monitoring.

Authorities continue to monitor the situation and advise the public to remain vigilant for potential outbreaks, especially in areas where mosquitoes may breed.