Greece has recorded nine deaths linked to West Nile virus this year as infections continue to rise, with health authorities reporting 110 cases since the start of the 2026 transmission season through August 12.
According to the Hellenic National Public Health Organization, EODY, 81 of the 110 patients developed serious symptoms affecting the central nervous system. All nine people who died were over the age of 65.
The latest figures come after 45 new domestically acquired cases were reported during the previous week, indicating a significant increase in West Nile virus activity as Greece enters the peak of the summer mosquito season.
Cases have been identified in 39 municipalities across 14 regional units in Attica, Thessaly, Central Macedonia and the Peloponnese. Attica, Greece’s most populous region, has experienced particularly intense circulation of the virus this year.
Nine deaths by mid-August
Epidemiologist Theodora Psaltopoulou warned that the death toll has already reached the level recorded much later in the 2025 transmission season.
Speaking to SKAI, Psaltopoulou said Greece had reached nine deaths by mid-August—the same number recorded last year by late October or early November.
She cautioned that this does not necessarily mean deaths will continue to increase at the same rate every month but said the country could ultimately record a higher toll this year.
Psaltopoulou said several factors can contribute to the spread of mosquitoes, including mild winters and prolonged periods of warm weather. She noted that West Nile virus activity is also being reported elsewhere in Europe.
Older people face the greatest risk
West Nile virus is primarily transmitted through the bite of infected mosquitoes. Many infected people experience no symptoms, while others may develop a mild illness.
A smaller number can develop serious neurological complications, including encephalitis or meningitis. Older adults and people with underlying health conditions or weakened immune systems face a greater risk of severe disease.
EODY has warned that additional cases are expected in the coming weeks, both in areas where infections have already been detected and in new parts of the country.
The continued spread has prompted authorities to stress the importance of mosquito protection, particularly for older and vulnerable people, as the 2026 transmission season continues.
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