The Hellenic National Public Health Organization (EODY) reported eight new cases of West Nile virus infection and two deaths during the last week in Greece.

Total Cases in 2025

Since the start of the 2025 transmission season and until September 17, doctors have diagnosed and investigated 83 domestic cases.

• 68 patients showed symptoms affecting the Central Nervous System (CNS), such as encephalitis, meningitis, or acute flaccid paralysis.
• 15 patients had mild symptoms or no CNS involvement.

In addition, two imported cases were recorded. These patients were infected abroad (one in Serbia, one in Italy) and are not included in the detailed analysis.

So far, seven people over 65 years old with CNS complications have died. The median age of those who died was 80 years (range: 66–86).

Geographic Spread

West Nile virus cases have been confirmed in 37 municipalities across 20 regional units in Greece. These include:

• Attica (West Attica, West Athens, Central Athens, North Athens, East Attica, Piraeus, Islands)
• Ilia, Achaia, Aetolia-Acarnania
• Evros, Larissa, Karditsa, Trikala
• Arta, Pella, Imathia, Euboea
• Corinthia, Messinia

Outlook and Precautions

EODY expects more cases in the coming weeks. The spread of the virus depends on several factors, making it impossible to predict the exact regions that will be affected.

The organization urges everyone to take personal protective measures against mosquitoes across the country throughout the mosquito season.

Situation in Europe

In 2025, until September 10, West Nile virus cases have also been reported in several European Union and neighboring countries, including: Albania, Bulgaria, France, Italy, Spain, Hungary, Romania, Serbia, and Turkey.