Health authorities across Greece—and throughout Europe—are on heightened alert as the West Nile virus (WNV) surges across the continent. The virus has now been confirmed in nine European countries, with Greece reporting the second-highest number of cases after Italy.
A Complex, Multi-Factor Outbreak
Experts describe the current WNV outbreak in Europe as a multifactorial phenomenon. While unusually high temperatures and irregular rainfall patterns have created ideal breeding conditions for mosquitoes, other ecological factors—including populations of wild birds and specific mosquito species—play critical roles in transmission. Birds serve as natural reservoirs for the virus, while certain mosquitoes—primarily Culex pipiens—act as vectors, transmitting the virus to humans through bites.
Symptoms Range from Asymptomatic to Severe
Approximately 80% of people infected with WNV show no symptoms at all. Around 20% develop mild, flu-like illness—fever, headache, muscle aches, fatigue, and sometimes a skin rash. In rare cases—about 1% of infections—the virus can invade the central nervous system, leading to serious neurological complications such as meningitis or encephalitis.
Patients exhibiting confusion, seizures, loss of consciousness, or paralysis require immediate medical evaluation and hospital admission. It is crucial to emphasize that WNV does not spread from person to person; human infection occurs exclusively through the bite of an infected mosquito. There is currently no approved antiviral treatment or vaccine for humans. Clinical management remains supportive—focused on symptom relief, hydration, and intensive care when needed.
Attica Bears the Brunt of the Outbreak
In Greece, 66% of confirmed cases have been reported in Eastern Attica and northern Athens suburbs. Twenty municipalities in these areas are under active surveillance and emergency response protocols. Among the most affected are the municipalities of Spata-Artemida, Markopoulo Mesogaias, Vary-Voula-Vouliagmeni, Agia Paraskevi, Pallini, and Chalandri—all reporting the highest numbers of neuroinvasive cases.
In Agia Paraskevi, municipal teams are conducting large-scale larvicidal and adulticidal spraying across thousands of drainage wells and public spaces. In Kifissia, environmentally safe biological agents are being applied to stagnant water bodies to target mosquito larvae. Meanwhile, in Soufli, innovative approaches are being trialed—including ‘smart’ traps that emit heat and species-specific odors to attract and capture female mosquitoes, aiming to suppress local populations and reduce disease risk.
Experts anticipate elevated mosquito activity—and thus continued transmission risk—at least until the end of September. In response, the Hellenic National Public Health Organization (EODY) has intensified both epidemiological and entomological surveillance, collaborating closely with Greek universities and research institutes to monitor virus circulation in mosquitoes, birds, and humans.