Greece: An increase in West Nile virus activity has been reported in Central Macedonia since Aug. 16

Event

Health officials have reported 60 cases of West Nile virus (WNV) in Greece from Jan. 1-Aug. 16, compared to only 12 cases reported over a similar period in 2021, 28 cases in 2020, and 49 cases in 2019. The most affected area is Thessaloniki (33 cases), followed by Imathia (12 cases) and Halkidiki (5 cases). This is the most updated information as of Aug. 23.

Context

Greece reported 311 human WNV cases during all of 2018 and 47 cases in 2017. The vast majority of WNV cases in Greece are reported during the high season, which runs from June to November.

West Nile virus is transmitted through the bite of an infected mosquito. Most infected people develop no symptoms. However, approximately 20 percent of infected people develop febrile illness characterized by symptoms of fever, headache, body aches, joint pains, vomiting, diarrhea, and rash. Fewer than 1 percent of infected individuals develop serious neurologic illness, which can be life-threatening. Symptoms typically appear 2-6 days after being bitten, but can develop up to 14 days after exposure.

Advice

Avoid mosquito bites and remove standing water to reduce the number of biting mosquitoes. Seek medical attention if symptoms develop within two weeks of being in affected areas.