RIVM says Netherlands will continue dealing with West Nile virus

Infections and Fatalities Reported Across the Netherlands

The RIVM reported that the total number of human infections reached 56, with nine patients having died from a West Nile virus infection in 2026, as noted by bnr.nl and Nieuwsblad.be. Reporting from Medi-Sfeer.be tracked an earlier count of 44 diagnosed cases and five deaths, illustrating how the figures climbed as weekly updates brought new data. Nieuwsblad.be detailed a batch of 12 newly registered infections that included four deaths, pushing the national death toll to nine. All infected patients contracted the virus through the bite of an infected mosquito, according to the RIVM data cited across the reports.

Differing Counts in Regional and Animal Surveillance

Outlets documented varying figures depending on their reporting windows, with Medi-Sfeer.be noting 16 new reports in a single week for a total of 44 cases, while Nieuwsblad.be recorded 56 total cases alongside 150 positive horse infections nationwide. Alongside humans and horses, the virus circulates naturally in wild bird populations, which serve as the primary reservoir for mosquitoes that subsequently bite humans.

Mosquito Season End Lowers Public Health Risk

RIVM physician Tjalling Leenstra told bnr.nl that the health agency is cautiously optimistic that the outbreak is nearing its end as the mosquito season draws to a close at the end of this month. Leenstra stated that about one in a hundred infected people develop severe symptoms, meaning the overall risk to the Dutch population remains small despite serious consequences for affected individuals. The RIVM advised residents to prevent mosquito bites by wearing long sleeves, keeping mosquitoes out of homes, and sleeping under mosquito nets.

West Nile Virus Becomes Permanent in Netherlands

Leenstra told bnr.nl that it is now certain the Netherlands will continue dealing with the West Nile virus in coming years because the country has proven suitable for its transmission and the virus appeared relatively early in the season. The virus causes no symptoms in roughly 80 percent of infected individuals, while about 20 percent experience a mild flu-like syndrome featuring fever, headache, and fatigue, as reported by Medi-Sfeer.be. Less than one percent of cases progress to severe neurological complications such as encephalitis or meningitis, with older adults and immunocompromised individuals facing a higher risk.